Suunto Blog

Ever noticed that a morning run can feel sluggish, while the same workout feels easier in the afternoon? Performance depends on training volume, intensity and how well you've adapted, and also on the time of day you train. Your circadian rhythm shapes how you feel and function from hour to hour, and exercise can shift that rhythm in turn. That doesn't mean everyone should train at the same hour. The best workout time is the one that lets you sleep enough, train consistently and recover well. This guide explains how circadian rhythms and chronotypes work, how your body clock and exercise influence each other, and how to schedule your workouts around your goals, daily habits and activity data. At a Glance Circadian rhythms regulate sleep, wakefulness, body temperature and other daily biological processes. Your chronotype shapes when you naturally feel most alert and perform at your best. When you exercise can shift your circadian rhythm and, with it, your sleep-wake schedule. Choose workout times around your chronotype, training goals, daily routine and recovery needs. Suunto watches with supported features track sleep, HRV and training load, helping you see how workout timing, sleep, training status and recovery influence one another. What Is a Circadian Rhythm? A circadian rhythm is the cycle of physical, mental and behavioral changes your body goes through over roughly 24 hours, coordinating its functions across the day. It affects sleep-wake patterns, body temperature, hormone release, metabolism and alertness. These rhythms are generated and regulated by your internal biological clock, or body clock. It keeps running even without external time cues, and its natural cycle may be slightly longer or shorter than 24 hours. Your body clock is made up of a master clock and peripheral clocks spread through your tissues. The master clock, the suprachiasmatic nucleus (SCN) in the brain's hypothalamus, coordinates rhythms across the whole body, while peripheral clocks in muscles, the liver and other tissues help regulate local functions. To stay in sync with the day-night cycle, your body clock relies on timing signals from the environment. Light is one of the most powerful, and meal timing, exercise and daily activity patterns may also play a role. These synchronizing signals are known as zeitgebers. What Is Chronotype? Body clocks don't all run on the same schedule, so natural bedtimes, wake-up times and peak-energy hours vary from person to person. This natural preference for certain sleep and wake times is your chronotype. Chronotypes are usually grouped into three categories, though the lines between them are blurry and many people fall somewhere in between: Morning Type: Naturally goes to bed and wakes up early, and usually feels most energetic in the morning. Intermediate Type: Falls between early and late sleep-wake schedules, with no strong morning or evening preference. Evening Type: Naturally goes to bed and wakes up later, and may feel most alert in the afternoon or evening. Evening types are often called night owls. Chronotype is shaped by age, genetics, light exposure and lifestyle, so your sleep and wake times can shift across different stages of life and living situations. An evening chronotype is a normal individual variation, not a sleep disorder. As long as you get enough sleep and your days aren't significantly affected, being a night owl is simply how your clock runs. How Are Circadian Rhythm and Exercise Connected? The same workout can feel different in the morning and the evening, thanks to daily swings in body temperature, alertness and other physiological processes. The connection runs both ways: your body clock influences your training, and the timing of your training can shift your body clock. How Circadian Rhythm Influences Exercise Performance and Recovery Circadian rhythms shape your physiological state across the day, which can affect performance, how a workout feels and how well you sleep and recover afterward. The main effects include: Body Temperature and Muscle Function: Core body temperature typically reaches higher levels in the afternoon to early evening. Changes in body temperature can affect muscle contractions, force production, and movement coordination, contributing to daily variations in strength, power, and other aspects of athletic performance. For runners, the same workout may feel different and produce different results depending on when it's performed, although endurance performance does not necessarily follow the same pattern of variation. Alertness and Attention: Circadian rhythms influence alertness and cognitive performance throughout the day, which may affect attention and reaction time during exercise. When you're sleepy or less alert, it may be harder to stay focused, and you may take longer to respond to external stimuli. Hormones and Energy Regulation: The secretion of many hormones varies with circadian rhythms. These changes help regulate various physiological processes, including sleep, wakefulness, and energy metabolism, and may further influence energy levels during daily activities and physical performance. However, the level of any single hormone alone cannot determine which time of day is best for training. Sleep and Recovery: Circadian rhythms help coordinate the body's sleep-wake cycle. When your sleep schedule is misaligned with your internal biological clock, sleep quality and daytime energy levels may be affected, which can in turn influence training performance and post-exercise recovery. How Exercise Timing Affects Circadian Rhythm Exercise can shift the phase of your circadian rhythm, meaning where a biological rhythm sits within the 24-hour cycle, such as when you start to feel sleepy at night or naturally wake up in the morning. When that timing moves, it's called a phase shift: earlier is a phase advance, and later is a phase delay. Light exposure, routine changes and exercise can all cause phase shifts. If you usually start feeling sleepy around 10 p.m., for example, a change in when you exercise may move that feeling earlier or later. The direction of an exercise-induced phase shift depends on when you work out and on your chronotype. A study involving 52 young, sedentary adults asked participants to complete 30 minutes of moderate-intensity exercise in either the morning or evening for five consecutive days. The results showed that morning exercise generally advanced circadian rhythm phase. Further analysis by chronotype found that evening exercise could cause a phase delay in morning types, while both morning and evening exercise caused a phase advance in evening types. In this study, the morning and evening windows were set relative to each participant's own body clock rather than to fixed clock times. So the findings can't be turned into one fixed workout time for everyone. How to Align Your Workout Schedule With Your Circadian Rhythm Natural sleep schedules and energy patterns differ, so the best time to exercise varies from person to person. Weigh your sleep, goals and daily schedule to find the right time, and use light exposure, workout timing and consistent routines to adjust your rhythm gradually when you need to. Understand Your Natural Rhythm Understanding your chronotype starts with simple observation. Track your natural sleep and wake patterns over a few weeks: Log your bedtime, wake-up time and sleep duration each day, and note any big differences between training days and rest days. Notice when you tend to feel sleepy, when your energy and focus peak, and when you feel most ready to train. Notice whether sleepiness or low energy regularly affects your morning or evening workouts. These observations give you a clearer sense of your chronotype and whether your current schedule fits your natural rhythm. Choose Workout Times Based on Your Needs When choosing workout times, consider your chronotype, training goals, physical condition, and daily schedule rather than relying solely on whether you're a morning or evening type. Easy Runs: Prioritize a time that's easy to stick to and doesn't cut into your sleep. Morning workouts may fit more naturally into the routines of morning types, while evening types may prefer a time during the day or afternoon when they feel more ready to exercise. High-Intensity Workouts, Such as Intervals and Tempo Runs: Try to schedule these workouts when you're alert and feeling physically ready. If you often feel that your body hasn't fully woken up during morning workouts, allow more time for your warm-up or consider adjusting your workout time. Race-Specific Training: If you already know your race start time, consider scheduling some workouts at a similar time of day. This can help your body gradually adapt to exercising at that time while allowing you to monitor your sleep and recovery. These are guidelines, not fixed rules. Even if you have an evening chronotype, you can still train in the morning as long as you get enough sleep, warm up properly, and can meet the demands of the workout. The key is to find a schedule that supports your training goals and that you can maintain over time. Support Your Body Clock With Daily Habits Coordinating light, exercise timing and daily activities gives your body consistent timing cues that help you hold or adjust your routine: Use Light Exposure: Get natural light soon after waking to tell your body the day has started. A morning run outdoors gives you that light at the same time. Before bed, keep bright light to a minimum. Adjust Exercise Timing: To shift your schedule earlier, move some workouts to the morning or earlier in the day, paired with morning daylight and a consistent routine for steadier timing cues. Keep Daily Routines Consistent: Try to maintain relatively consistent wake-up and main meal times, and avoid major fluctuations in your daily schedule. When changing your sleep or workout schedule, start with small steps and let your body's response guide the next one. Go at your own pace, and skip the all-nighters: forcing a schedule change by staying up all night is not recommended. If you're considering using melatonin to adjust your sleep schedule, consult a doctor or pharmacist first rather than following a one-size-fits-all recommendation for timing and dosage. How Can Data Help Adjust Training With Your Body Clock? Beyond chronotype and schedule, your sleep, training and recovery data can show whether your current routine fits your body clock. Observe Connections between Workout Timing and Sleep Check whether workout timing affects your sleep. Along with your usual sleep patterns, note the start and end time of each workout. Look for links between workout times and changes such as later bedtimes, shorter sleep or poorer sleep quality, and notice how you feel the next morning and whether your daytime energy changes. Sleep tracking on Suunto sports watches lets you review your sleep times, duration and multi-day trends, and pairing that data with how you feel gives you a fuller picture. If certain workout times keep disrupting your sleep, shift your training to leave enough room for rest and recovery. Check whether your sleep affects your training. Compare each night's sleep with your performance the next day. Notice whether short sleep, a late bedtime or poor sleep quality leaves you more tired, low on energy or struggling to finish planned sessions. If that pattern repeats, your sleep schedule may be holding your training back, so adjust your routine or that day's workout. Combine Training Performance, HRV and Body Feedback Use Training Performance to Monitor Changes in Exercise Capacity In addition to sleep records, compare training data from different times of day to see how your performance varies. For example, under similar training conditions, check whether your heart rate at the same pace shows consistent changes, or whether your pace decreases when maintaining the same heart rate. If you use a Suunto device that supports running power, you can also monitor whether you can consistently maintain your target power and workout intensity. At the same time, pay attention to how you feel during the same workout. Notice whether you become fatigued more easily than usual or find it harder to reach your expected performance level. Use Heart Rate Variability (HRV) to Assess Recovery HRV can serve as a reference for monitoring recovery, but it does not directly measure circadian rhythm phase. Suunto devices that support HRV recovery tracking compare your 7-day rolling average HRV with your personal baseline range to help you identify persistent changes. For example, if your HRV remains outside your normal range after several consecutive evenings of high-intensity training and you also feel more fatigued in the morning, compare these changes with your sleep records and recent training to see whether they may be related to your workout schedule. Consider Training Load and Other Lifestyle Factors Review your recent workout frequency, duration, intensity, and training load in the Suunto App. Compare these with changes in sleep, training performance, and HRV to see whether your physical condition may be related to adjustments in your training schedule. Also consider other factors that may affect sleep, performance, and recovery, such as work stress, alcohol consumption, and illness. Since all these factors can affect your physical condition, looking for consistent patterns across multiple indicators can help you better assess whether your workout schedule and daily routine align with your circadian rhythm and make adjustments accordingly. Where to Find Sleep, HRV and Training Data on Suunto Once you know which data to pay attention to, you can use the Suunto App and your sports watch to review your records and monitor changes in training performance, training load, sleep, and recovery over time. In the Suunto App: Sleep and recovery data: Go to Training Zone-> Recovery to view Training Fatigue, Sleep, and HRV. You can also find the corresponding data widgets on the Dashboard. Training performance data: Go to Training Zone-> Training / Progress or Activities to review workout records and related performance data. On Your Suunto Watch: Use the corresponding widgets to view sleep, recovery, and training data. Available metrics and displayed information vary by watch model. Takeaways Your best workout time is one that fits your sleep, recovery and daily routine as well as your energy. Start with a schedule you can keep, then use your sleep, recovery and training data in Suunto to see whether it needs adjusting. Look for patterns over weeks rather than overhauling your plan based on a single workout or one night's data. FAQ Is there a best time of day to exercise? There is no single best time to exercise that works for everyone. When choosing a workout time, consider your chronotype, training goals, daily schedule, and sleep patterns. In the long run, consistency and getting enough recovery matter more. Can evening exercise affect sleep? Not necessarily. For most healthy adults, finishing a workout several hours before bed has little effect on sleep. High-intensity exercise close to bedtime may delay sleep onset or affect sleep quality for some people, so adjust your workout's end time and intensity based on how you respond. Can a sports watch measure your circadian rhythm? Not directly. A sports watch can't measure the phase of your internal clock, but it tracks sleep timing, HRV and exercise data that help you see changes in your routine and training status. Use that information as a reference when adjusting workout times; it's no substitute for a professional circadian rhythm assessment. How can you adjust your schedule before a race in another time zone? Start shifting your sleep and wake times gradually a few days before you leave. Traveling east generally means shifting earlier, and traveling west means shifting later. Once you arrive, follow local meal and activity times, and time your light exposure and light avoidance to your direction of travel and the time difference. Adjust training intensity to your sleep and travel fatigue as well.

It's the evening before race day. You've picked up your bib at the expo, and your legs feel heavy after hours of flying, driving and shuffling through exhibition halls. Your body is tired, but your mind is wide awake with pre-race excitement and nerves. With the start line waiting tomorrow morning, one question creeps in: should you head out for a short jog right now? It's one of the most common questions of race week, and the answer lies in the shakeout run. In running communities and race-prep plans, this short pre-race jog has a name: the shakeout run. Some runners treat it as an essential ritual to wake up the body. Others worry that every extra step spends energy they'll need on race day. Exercise physiology and real-world training practice show what a shakeout run does, when it makes sense and how to keep the intensity in check, so you can combine your own habits with objective data and choose confidently between an easy jog and a full rest day. What Is a Shakeout Run? A shakeout run is a short, very easy jog done the day before a race or on race morning. Its purpose is to keep your body connected to its natural running mechanics and cadence through a gentle dynamic stimulus, with no added training load or muscle fatigue. Mileage and aerobic fitness are built earlier in your plan. Done right, a shakeout run leaves your legs feeling lighter and fresher than when you headed out the door. Before a marathon, a typical shakeout run is a very easy jog of about 10 to 30 minutes, even more relaxed than a normal easy run. Both that duration and the rough distance of 2 to 5 km are practical reference ranges shaped by coaches and runners over years of race preparation, rather than fixed rules. What Are the Benefits of a Shakeout Run? "Shakeout run" is a term from everyday training and racing. There's a few different reasons you do them, so we'll help shed light on how it works and why you should consider adding them to your training. Maintaining Pre-Race Readiness Once your taper begins and weekly mileage drops sharply, your body gets the chance to recover from accumulated training load. After several days without running, though, some runners find their legs feel wooden and their stride awkward, a state often called "feeling flat." A meta-analysis of 27 experimental tapering studies found that the most effective tapers progressively cut training volume while maintaining existing training frequency, keeping a regular exercise stimulus throughout. An experimental study on middle-distance runners found the same pattern: athletes who kept up short, frequent daily sessions during the taper achieved significantly better 800 m performance and physiological readiness than those who took a full rest day every third day. A shakeout run follows the same thinking. A brief, very light dynamic stimulus may help you hold on to a familiar running rhythm and physical state. If you usually run most days of the week, this gentle activation helps you keep a familiar feel for the ground at the start line while keeping extra fatigue to a minimum. Keeping the Legs Moving If you're traveling to an out-of-town race, the journey itself is often one of the biggest challenges of the final day or two. Hours on a plane, a high-speed train or in a car, followed by long stretches in a hotel room, can easily leave your legs heavy. A short shakeout run after you arrive gets stiff legs moving again, shakes off the post-travel sluggishness and helps you find a light, easy stride. On the physiological side, a meta-analysis on prolonged sitting and vascular function shows that after several hours of uninterrupted sitting, blood vessel dilation in the legs drops while the arms remain largely unaffected, and that breaking up sitting time with a few minutes of light lower-body activity largely offsets the drop. A randomized crossover trial observed a similar pattern: lower-limb arterial stiffness rose after three hours of continuous sitting, and one minute of bodyweight movement at regular intervals reversed the trend. These studies stop short of proving that a shakeout run improves circulation or race times, but in real-world race prep, a short, very easy jog is a practical way to get your body moving. Easing Pre-Race Nerves Evidence on the mental side is more indirect, but runners feel the effect widely. As a big race approaches, pent-up energy from the reduced taper volume mixes with worries about pacing and finish goals, and restlessness sets in. A meta-analysis of 36 randomized controlled trials shows that a single session of aerobic exercise produces a small but statistically significant reduction in acute state anxiety. This is a real but modest aid, one factor among many on race day. Still, a calm, unhurried jog through a park or along a path near your hotel draws your attention away from replaying tomorrow's race and back to steady breathing and footstrikes, making it easier for mind and body to settle the night before. Should Runners Do a Shakeout Run? A shakeout run can help on race day, and it's entirely optional. Weigh your race-prep situation and your body's recovery signals to decide whether to run or rest. When a Shakeout Run Is Worth Doing Based on the physiology above and practical experience, a shakeout run is usually worth doing in three situations: After long travel or prolonged sitting: Hours of flying or driving to an out-of-town race often leave your body and legs feeling heavy. Once you've settled in at your destination, a short jog loosens up the joints and muscles of your lower body. If you run often and already do a pre-race easy run: If you log higher weekly mileage or train frequently, and you routinely schedule an easy run the day before a long run or hard workout, sticking to that rhythm is safer than switching to several full rest days in race week, and it keeps your body from going stale. Before a short race like a 5K or 10K: These races start fast from the gun, so arriving ready matters. Some research suggests that pre-competition priming exercise may help the body adapt more quickly to the high-intensity effort that follows. Priming exercise and a shakeout run are different things, though. If you're already used to pre-race easy runs, consider a short, easy jog the day before, depending on your habits and recovery. When to Skip or Shorten a Shakeout Run Recovery always comes first. Weigh whether a shakeout run is worth it based on how well you're recovering and the conditions around you: Sleep debt or extra fatigue: After a poor night's sleep, alcohol the evening before, or a high step count from walking the expo and sightseeing during race week, your body needs to save its energy for the race. Shorten the jog to around 10 minutes, or skip it and take a full rest day. Poor conditions or a history of slow recovery: Bad weather, slick or crowded streets, a tight race-morning schedule, poor subjective recovery, rising fatigue, or a past pre-race jog that left you tired for more than a day are all good reasons to shorten or skip it. Your Suunto watch's "Recovery" reading gives you an objective reference: if it shows "Fair" or lower, your readiness may be below par, and shortening or skipping the shakeout run is worth considering. Always judge readiness alongside how your body actually feels, rather than on a single number. How to Do a Shakeout Run Right Once you've decided to head out, the key is running it without turning it into a drain. Get three things right and the run will support your race-day readiness: timing, duration and intensity. How Many Hours Before the Start Should It Happen? Depending on race distance and start time, you have two main timing windows: The day before the race (about 18 to 24 hours before the start): The most common and dependable choice, especially for half marathons and marathons. Running in the morning or early afternoon loosens up your body and leaves the rest of the day for rest, hydration and carbohydrate loading, while keeping late-day exercise from disturbing your sleep. Race morning (about 2 to 2.5 hours before the start): More common before shorter races like a 5K or 10K, or as an extra wake-up routine for experienced runners, with plenty of buffer before corral check-in and your official warm-up. If your race starts very early, breakfast, transit, bag check and corral entry already fill most of the morning, so the day before is the better choice. How Long Should a Shakeout Run Be? Use 10 to 30 minutes as a general guide. There's no set distance or time for each race distance, so within that window, tailor the duration to your usual training and how your body feels that day: Lower-mileage or first-time racers: Aim for the short end. There's no need to copy the shakeout mileage of elite athletes, and 10 to 15 minutes is often plenty to wake up the neuromuscular system and settle pre-race nerves. Frequent runners used to pre-race jogging: 15 to 25 minutes works well. Keep it under 30 minutes. A simple cue for when to stop is the feeling that your body has loosened up. Once a light, easy rhythm clicks in, finish a few minutes early rather than adding load just to round off a kilometer or a time on your watch. How Fast Should a Shakeout Run Be? Err on the slow side and keep it very easy, ideally a notch slower than a regular easy run. A review of pre-race tapering published in Sports Medicine shows that tapering often brings marked gains in muscle strength and power, driving overall performance improvements. Those gains are linked to falling creatine kinase levels as training load drops, a sign that training stress and muscle micro-damage are being repaired. Keeping your shakeout run easy protects that recovery and adds no extra fatigue. In practice, combine how you feel with objective watch data to keep the intensity low: How you feel (RPE and the talk test): Keep your rate of perceived exertion (RPE) at 2 to 3 out of 10, with light, steady breathing that passes the "talk test" the whole way, meaning you can speak in full sentences with ease. Objective data (heart rate zone monitoring): A compatible Suunto watch shows your intensity zone in real time, a useful aid for keeping effort in check, though how easy the run feels should remain your main guide. Aim to stay around Zone 1, typically 50% to 60% of maximum heart rate. Suunto supports both default zones and custom personal heart rate zones. To set it up, open the "Running" mode, scroll down to "Exercise options", select "Intensity zones" and then "HR zones", press the "lower button" to set the target zone and tap "Zone 1". If your heart rate rises above Zone 1 during the run, the watch alerts you. Common Mistakes in a Shakeout Run Even when you know the duration and heart rate guidelines, race-week emotions and distractions can still lead to missteps. Here are the four most common shakeout run mistakes and how to sidestep them. Running Too Fast or Too Long This is the classic mistake. Fresh from the taper, you step out the door feeling energized and light on your feet, the pace creeps up without you noticing, and a relaxed loosener turns into a moderate workout. Or you feel so good that you run well past the 30-minute mark. Trying New Things Before the Race Save new gear for after the race. The most common mistake is lacing up brand-new race shoes for a shakeout run, or wearing new socks, shorts or a sports bra. Even on a 15-minute jog, untested shoes or seams can cause blisters or chafing. Getting Swept Up by the Group Around major races, brands and running clubs often host lively official or community shakeout runs. Joining one is a great way to soak up the race-weekend atmosphere, but the biggest trap is getting pulled along by the crowd: running faster or farther than planned, or comparing paces with others, which defeats the purpose of keeping it very easy. A sports psychology study found that when other runners were present, social facilitation led athletes to run the first 500 m significantly faster than when starting alone. The study doesn't test group shakeout runs directly, but it clearly shows the tendency to speed up unconsciously in company. If you join a group shakeout, use the methods above to keep your intensity firmly in check. If you know you'll get carried away, a solo run is the safer bet. Cutting the Timing Close or Overreading Your Legs Two other details are easy to miss. The first is timing it too close: on race morning especially, running too near the gun rushes corral check-in, bag drop and bathroom stops, and eats into your recovery buffer. The second is treating how your legs feel on the shakeout as a forecast for race day. Some runners feel slightly heavy-legged and start worrying about tomorrow, yet heavy legs the day before are common and say little about how you'll race. Conclusion Back to the original question: should you head out for that short jog the day before the race? The answer comes from your own training habits and how your body responds, rather than a one-size-fits-all template. A shakeout run is a helpful option rather than a must. Done right, it keeps your familiar feel for the ground and takes the edge off pre-race nerves. When you're tired, a full rest day is an equally smart call. For the most reliable answer, test it ahead of time instead of trying it for the first time in race week. Pick a regular long-run day in your training cycle, do a short shakeout run the day before, and pay attention to how light your legs feel, your overall fatigue, and your pace and heart rate in the next day's session. Once you know how your body responds in training, the call the night before the race comes naturally. FAQ How long should a shakeout run be? Generally 10 to 30 minutes. Adjust the exact duration to your training experience, daily habits and race distance, and treat 30 minutes as the upper limit. Should you wear your race kit? Yes, as long as it's broken in. Wearing the singlet, shorts and shoes you plan to race in, even with your bib pinned on, is a final check that everything fits and moves without chafing, and it brings you closer to race-day feel. The one firm rule: every item must already be thoroughly tested in training. Save brand-new shoes and socks for after the race. Can a shakeout run hurt performance? If you're used to pre-race easy runs and well recovered, a short, easy jog usually adds no noticeable fatigue. The real risk is overdoing it, stretching the distance or pushing to normal training pace because you feel good, and turning a relaxed jog into a draining workout. If you're already noticeably tired before the race, a full rest day is the safer choice.

As race day gets closer, your long runs start getting shorter and your weekly mileage begins to drop. This is the marathon taper, and it's one of the most important phases of your training. When should you start? How much should you cut? Should intensity and frequency come down too? This guide explains how to adjust your training during the taper, walks through a three-week example and shows how to use your training log, recovery data and your own feedback to keep the taper on track. What Is a Marathon Taper and Why Does It Matter? A marathon taper is a planned reduction in training load before race day. You cut volume and adjust your schedule to shed accumulated fatigue while holding on to the fitness and adaptations you've built. The goal is to reach the start line fresh and ready. Research has found that tapering before competition can significantly improve endurance athletes' time-trial performance and time to exhaustion. How Long Should a Marathon Taper Last? Most marathon tapers last two to three weeks. A study of training data from more than 158,000 recreational marathon runners found that steadily reducing weekly mileage over the final two weeks was linked to better race performance than a less consistent two-week taper. Runners who followed a strict three-week taper also saw a significantly larger estimated finish-time benefit than those on a strict two-week taper. To set your taper length, start with your existing plan: note when the taper begins and how many weeks it runs before race day. Stick with that schedule rather than switching at the last minute to a different approach you've read about. How Should You Adjust Training During a Marathon Taper? During a marathon taper, you gradually reduce weekly mileage while fine-tuning intensity, frequency and long-run timing. A common approach is to cut overall volume, keep some familiar intensity and your usual running days, and finish your last major long run well before race day. How much you adjust, and when, depends on your training background and your plan. How Much Should You Reduce Your Mileage? Use the step-down in weekly mileage from your peak week to race week as your guide: High-mileage group (over 90 km/week): 22% ± 12% Medium-mileage group (65 to 90 km/week): 28% ± 12% Low-mileage group (under 65 km/week): 31% ± 13% In plans with a three-week taper, mileage dropped further on average from the second taper week to race week: High-mileage group: 46% ± 17% Medium-mileage group: 54% ± 16% Low-mileage group: 50% ± 24% These figures describe what existing training plans do, not experimentally proven optimal targets. Weigh them against your own training background and plan, and remember that race-week mileage excludes the marathon itself. Should You Maintain Running Intensity During a Taper? For the most part, yes. Keep some intensity while you reduce overall volume. Hold on to familiar sessions from your plan to keep your speed sharp, and trim their distance, duration or number of reps. Work from your existing plan: shorten familiar workouts as needed, and save new high-intensity sessions for your next training block. How Should You Adjust Running Frequency? Most runners keep their usual number of running days during a taper and reduce the volume of each run, bringing total volume down gradually. If you normally run five days a week, keep running five days and shorten each run's distance or duration. Whether to drop a running day depends on your plan and your individual circumstances. When Should Your Final Major Long Run Be? Your final major long run usually falls three to four weeks before race day. Exact timing and distance depend on your experience, overall plan and recovery, and should leave enough time to recover before the taper starts. You can also learn more about how to recover after a long run to better understand the recovery process following your final major training run. Some plans include shorter long runs during the taper. Keep them as scheduled and let their distance come down gradually as race day approaches. What Does a Marathon Taper Schedule Look Like? A three-week taper plan shows how training volume steps down before race day, and how long runs and intensity are adjusted along the way. The table below uses an example peak-week mileage as the baseline to show how weekly mileage, long runs and training focus change across the three weeks. Phase Example Weekly Mileage Long Run Intensity and Frequency Example Peak Week 45 mi (about 72.4 km) Complete your final major long run Follow your existing training plan Taper Week 1 31–36 mi (about 50–58 km) 14 mi (about 22.5 km) Maintain familiar training intensity and your usual running frequency while reducing the volume of individual workouts Taper Week 2 21–25 mi (about 34–40 km) 10 mi (about 16.1 km) Continue with familiar training intensity and running frequency while further reducing the volume of individual workouts Race Week 15–20 mi (about 24–32 km) during the six days before race day No regular long run Focus on short, easy runs. Take a complete rest day two days before race day. The day before race day, you can choose to do a very easy 20–30-minute run. Keep in mind that these mileage percentages and long-run distances are examples and are not fixed guidelines for all runners. You can use this plan as a reference for understanding the structure of a three-week taper. Compare it with your own training schedule to see whether your weekly mileage is gradually decreasing, whether your final major long run is complete, and whether you've allowed enough time for recovery during race week. If your existing training plan already includes a taper, prioritize following that plan and adjust your training volume and recovery based on your current training condition. Common Marathon Taper Mistakes During a taper, it's normal for your training volume to gradually decrease. As race day approaches, suddenly increasing your mileage, making up missed workouts, or copying another runner's plan can all disrupt your taper schedule. 1. Adding Mileage or Intensity at the Last Minute Some runners worry that they're not running enough as their training volume decreases, leading them to suddenly add more mileage or high-intensity workouts. However, a taper is a planned reduction in training load. Having a weekly mileage total that's significantly lower than your peak week doesn't mean you've lost the fitness you've built up. To determine whether your taper is on track, consider its duration, your existing training plan, and your recent recovery rather than looking at mileage alone. If your original plan has already entered the taper phase, avoid suddenly returning to your regular training volume simply because you're worried about running too little. 2. Trying to Make Up for Every Missed Workout Missing a workout doesn't mean you have to make it up over the next few days. Whether you need to adjust your upcoming training should depend on your existing plan, how close you are to race day, and your current training load. This is especially important during a taper, when trying to make up missed workouts can disrupt your planned reduction in training volume and add extra training stress. Rather than automatically adding the missed mileage or workout to your next run, review your upcoming schedule first and decide whether any adjustments are actually necessary. 3. Copying Another Runner’s Taper Plan Another runner's pre-race taper plan can be a useful reference, but it may not suit your training needs. Even when preparing for the same marathon, runners can have different training backgrounds and recovery needs. When reviewing someone else's plan, consider these three factors: Training background: Compare your weekly mileage before tapering, the number of days you run each week, and the distance of your recent major long runs to see how similar your training backgrounds are. Taper structure: Look at how many weeks before race day the other runner starts tapering, how their weekly mileage decreases, and how much training they schedule during race week. When comparing mileage reductions, make sure the calculations use the same baseline, such as the peak weekly mileage before tapering. Differences from your existing plan: Compare their schedule with your own and consider whether following it would require changing your current mileage, long-run distances, or workouts. Avoid adding training load or trying unfamiliar workouts just to match someone else's plan. Even if your training backgrounds are similar, you shouldn't copy another runner's weekly mileage or specific workouts directly. You can use their taper structure as a reference and decide whether to make adjustments based on your existing plan, how fatigued you feel, and your recovery. How to Monitor Training Load and Recovery During Your Taper You can monitor whether your taper is progressing as planned by looking at your training load trends, recovery-related information, and how you feel after each workout. 1. Check Your Training Load Trends First, review your recent training load trends against your training plan. Suunto sports watches provide training load data and trend views to help you understand your recent training. Through the Progress and Training views, you can access information such as Training Stress Score and long-term and short-term training load. Suunto watches for marathon training to learn more about the training and performance features available for runners. These metrics can help you understand changes in training load over different time periods: TSS (Training Stress Score): A measure of training stress calculated based on the duration and intensity of an individual workout. It describes the training load generated by that session. CTL (Chronic Training Load): Chronic training load, calculated as a weighted average of TSS over a longer period. ATL (Acute Training Load): Acute training load, calculated as a weighted average of TSS over the past seven days. It is used to track current fatigue levels. TSB (Training Stress Balance): Training Stress Balance, which reflects the difference between CTL and ATL and is used to describe fitness status. During your taper, compare your recent training load with your original plan to see whether your actual training volume is gradually decreasing. 2. Use Recovery Information to Understand Your Response to Training As your training load gradually decreases, you can also use recovery-related information to understand how your body is responding to recent training. You can monitor changes in HRV, sleep, and other recovery-related data during your taper to get a better understanding of your recent recovery. Learn more about how HRV can help you understand recovery and how to interpret changes in your HRV over time. For example, if your training load has decreased as planned but you still feel fatigued for several consecutive days, you can look at your recent HRV, sleep patterns, and other recovery data to better understand your recovery status. 3. Add Your Own Training Feedback In addition to objective data, your own feedback matters. The Feeling feature on Suunto sports watches lets you record how you feel after each workout. For example, pay attention to the following: Several consecutive runs feel harder than usual. An easy run at the same intensity feels more challenging than it did before. Consistently recording how you feel during training can help you understand your subjective response to your taper schedule and decide whether any adjustments are needed based on your existing plan. 4. Review Your Taper Plan Alongside the Data Finally, bring your training logs, recovery information, and personal feedback together and compare them with your existing taper plan to assess your progress and how your body is responding. If your actual training deviates significantly from the plan or your fatigue continues to increase, review your upcoming training schedule and consider whether adjustments are needed. If you're looking for a watch to support your running training, explore Suunto running watches to compare available models and their features.

Inside Joe Klecker's NYC Marathon Build What Changed in a Year on the Same Course Four 25-mile long runs. Marathon-specific workouts. A faster finish on the streets of New York. One year after his marathon debut at the 2025 New York City Marathon, Joe Klecker returned to the same course with more experience, deeper endurance and a sharper approach to racing. After running 2:05:56 at the 2026 Boston Marathon, Klecker focused on building the endurance to race hard for 26.2 miles while keeping the speed that defined his track career. On November 1, he finished the 2026 New York City Marathon in 2:09:28, placing 15th overall and taking 1 minute and 9 seconds off his previous time on the course. Through his partnership with Suunto, Klecker shared the training data behind his build, offering a closer look at his development as a marathoner. From Track Speed to Marathon Strength For most of his career, Klecker raced the 5,000m and 10,000m on the track, building the speed to compete at the highest level. The marathon asked for something different. Instead of leaning on fast workouts alone, Klecker shifted his emphasis toward the aerobic strength needed to hold his pace for more than two hours of racing. His training now blends short track intervals, longer repetitions and demanding marathon-specific sessions. The goal goes beyond getting faster. It's about keeping his speed and building the endurance to use it over 26.2 miles. Three Key Workouts: Building Marathon-Specific Fitness Workout 1 — 20 × 400m: Maintaining Track Speed Eight weeks out from New York, Klecker ran 20 × 400m on the track with 200m jog recoveries. Metric Training Data Workout 20 × 400m Average Split 66 seconds Recovery 200m jog, averaging 55 seconds Total Fast Running 8 km The marathon is now his focus, but speed remains a key part of his preparation. His coach, Dathan Ritzenhein, keeps VO₂ max sessions in the program to preserve the speed Klecker built on the track. Workout 2 — 4 × 5K: Changing Race Intensities Ten weeks out, Klecker ran four 5K repetitions with three minutes of recovery. The session alternated between half-marathon and marathon intensity. Repetition Time Average Pace 1 14:28 2:54/km 2 15:25 3:05/km 3 15:28 3:06/km 4 14:27 2:53/km After 15 kilometers of hard running, he closed with his fastest rep of the day. His final 5K took 14:27, one second quicker than his opening effort. The session showed his ability to switch gears while holding a strong overall effort. Workout 3 — 2 × 6 Miles: Best Week Yet Five weeks before New York, Klecker completed one of his most impressive marathon-specific sessions. Repetition Distance Time Average Pace Rep 1 6 miles 29:16 4:53/mi Rep 2 6 miles 28:47 4:48/mi The second rep built in deliberate changes of pace. He opened with a 4:25 mile, settled into four miles at around 4:58/mi, then closed with a 4:24 final mile. What mattered most was how the session felt. A year earlier, Klecker said, closing a workout like this at that pace would have taken a near-maximal effort. This time, it felt controlled, a clear sign of his improved marathon-specific fitness. The lesson: Sometimes progress means making fast running feel easier. Four 25-Mile Long Runs: Building Endurance Across his build, Klecker completed four separate 25-mile (40.2 km) long runs. Session Distance Time Average Pace Average HR Long Run 1 25 miles 2:19:29 5:35/mi 147 bpm Long Run 2 25 miles 2:20:03 5:36/mi 152 bpm Long Run 3 25 miles 2:18:46 5:33/mi 153 bpm Long Run 4 25 miles 2:16:32 5:27/mi 152 bpm Together, they added up to 100 miles of marathon-specific long running. His final long run was nearly three minutes faster than his first, at an average pace of 5:27/mi. Even so, Klecker's aim was consistency from one long run to the next, with speed following naturally. He focused on running each session at a controlled effort and finishing with enough in reserve for the next workout. The lesson: Marathon endurance is built on training you can repeat week after week. New York: A Year of Progress Klecker returned to New York one year after his marathon debut on the same course. Race Finish Time 2025 NYC Marathon 2:10:37 2026 NYC Marathon 2:09:28 Improvement 1 minute 9 seconds Finishing 15th overall, he improved his time on New York's demanding five-borough course. The result was slower than his 2:05:56 in Boston, and it marked another step forward in his development over the distance. For Klecker, every race is a chance to apply the lessons of training and gain experience against the world's best. His long-term goal remains the U.S. Olympic Marathon Trials, the race his mother, Janis Klecker, won in 1992. Beyond the Finish Line: Sharing the Journey Joe Klecker’s journey from the track to the marathon is about more than race-day results. Throughout his preparation for the 2026 New York City Marathon, Klecker invited the running community behind the scenes, openly sharing his training sessions, weekly progress, recovery, and personal reflections through Suunto and his social channels. Through his partnership with Suunto, that openness transformed training data into meaningful stories, allowing fans to follow his progress, understand his preparation, and experience the journey alongside him. His return to New York marked another step forward, but the story extends far beyond the finish line. The true story of running is never just about race day. It’s about every mile that gets you there. From track speed to marathon strength. From training data to authentic storytelling. The journey continues.

Training for a road marathon, or want one watch that covers running, cycling and hiking? That question is the best starting point for comparing Suunto Run 2 and Race S. Run 2 is built for road running and race preparation, with Marathon Mode and EnergySense. Race S takes a broader approach, with more sport modes and longer dual-band GPS battery life. Both watches track your runs and help you review your training, and the right pick depends on how you train and which features you will use. Short answer: Choose Run 2 for road running and race preparation. Choose Race S for multisport training and longer GPS battery life. Table of Contents Suunto Run 2 vs Race S: Key Differences Suunto Run 2 vs Race S: Running Features GPS Battery Life: Is Six More Hours Important? Offline Maps and Music: What Can Each Watch Do? Heart Rate Monitoring Display and Design: Brightness, Weight and Materials Which Watch Should You Choose? Suunto Run 2 vs Race S: Key Differences Feature Suunto Run 2 Suunto Race S Display AMOLED, up to 2,000 nits AMOLED, up to 600 nits Weight 35 g watch body; 53 g with strap 60 g stainless steel / 53 g titanium Dual-band GPS battery life Up to 24 hours Up to 30 hours Sport modes 34+ 115+ Marathon Mode Yes No EnergySense Yes No Ghost Runner Yes Yes, via SuuntoPlus Offline maps Yes Yes Storage 4GB/64GB 32GB Offline music Yes No Suunto Run 2 vs Race S: Running Features Both watches cover the essentials for tracking runs and reviewing training. Run 2 focuses on road running and race preparation, while Race S offers a wider range of sports and additional training tools. Suunto Run 2: Road Running and Race Preparation Marathon Mode: Provides real-time finish-time estimates based on your running pace and displays distance covered and race progress, helping you track your progress toward the finish line. EnergySense (Beta): A new feature on Suunto Run 2 that estimates your remaining endurance and how much farther you can run at your current effort. It helps road runners manage their pace during long runs and marathons, giving them a better idea of when to hold back or push harder. Running Dynamics: Run 2 has ground contact time and vertical oscillation to the running log summary, giving you more insight into your running form after each workout. Ghost Runner: Run 2 comes with a built-in Ghost Runner, letting you compare your pace with a virtual runner during training. Race S also supports Ghost Runner through SuuntoPlus. Suunto Race S: Multisport and Training Flexibility 115+ sport modes: Suits athletes who mix running with cycling, swimming and hiking. SuuntoPlus: Adds sport apps and training tools to your watch, including Ghost Runner. TrainingPeaks Sync: Both watches connect with TrainingPeaks. Race S also syncs structured training plans to the watch, and this feature is planned for Run 2 in a future software update. GPS Battery Life: Is Six More Hours Important? Race S records up to 30 hours with All-Systems GNSS and Multi-Band enabled, compared with up to 24 hours on Run 2. For everyday runs and most road races, both watches offer plenty of GPS recording time. The extra six hours on Race S matter more for ultramarathons, long days outdoors, or any activity that needs high-accuracy GPS for an extended period. These are maximum figures under specified conditions. Actual battery life may vary depending on settings, usage and operating conditions. If your activities rarely approach Run 2’s GPS limit, the extra runtime may not decide it for you. If you regularly record long sessions, Race S gives you more headroom. Offline Maps and Music: What Can Each Watch Do? Both watches support offline maps, but Run 2 has an additional advantage: offline music playback. With Run 2, you can store compatible music files on the watch, pair Bluetooth headphones and leave your phone at home. Race S doesn't support offline music playback, but you can still control music playing on your phone. If you prefer running without carrying your phone, Run 2 offers more flexibility. If you usually bring your phone along, this difference may matter less. Heart Rate Monitoring Both watches track heart rate during workouts, helping you monitor training intensity and review your effort over time. Suunto Run 2 features a 12-channel optical heart rate sensor beneath 2.5D curved glass. This updated sensor design is intended to support heart rate tracking during different types of running, from steady road runs to interval sessions. Wrist-based heart rate readings can vary with fit and movement. For more detailed heart rate data during structured training, both watches can also pair with compatible external heart rate sensors. Display and Design: Brightness, Weight and Materials A Brighter Display on Run 2 Run 2 delivers 2,000 nits of brightness, compared with 600 nits on Race S. That extra headroom makes pace, heart rate and workout data easier to read in strong sunlight. Outdoor readability depends on more than brightness, and battery use varies with screen settings. If screen visibility is a priority, the specs favor Run 2, and actual battery life still depends on how you use the watch. Lightweight Design and Materials Run 2 has a 35 g watch body and weighs approximately 53 g with its strap. Published weights for Race S are 60 g in stainless steel and 53 g in titanium. Run 2 is built around its 35 g watch body, while titanium Race S is also relatively light. Race S gives you a choice of bezel material, which may appeal if you prefer a different finish. Weight is personal. If you notice every gram on a long run, Run 2 is worth considering. If material choice matters more, compare Race S versions and their published weights before you decide. Which Watch Should You Choose? Choose Suunto Run 2 if: Road running and marathon preparation are your main priorities. You want our latest Marathon Mode and EnergySense modes. A brighter display and lightweight design appeal to you. You want offline music playback on your watch. Running-focused features matter more to you than a broad range of multisport tools. Choose Suunto Race S if: You regularly switch between running and other sports. You want more than 115 sport modes and SuuntoPlus. Longer dual-band GPS recording time matters to you. You want a choice between stainless steel and titanium versions. You want broader multisport training tools. Bottom Line Run 2 is the more focused choice for road runners who want race-specific tools in a lightweight watch. Race S suits people who want broader multisport support and longer GPS recording time. Start with your training routine, then choose the features you’ll use most.

Winter runs often start before sunrise or finish after dark. Cold weather raises questions beyond how your body copes: will the cold drain your watch battery, can you work the controls with gloves on, and can you reroute when a familiar path turns icy? A good winter running watch answers all three with dependable battery life, easy controls and capable navigation. This guide covers the features that matter most for everyday winter running, then compares two Suunto watches built for it, so you can find the right fit for the way you train. What to Look for in a Winter Running Watch Start with where and how you run. A winter watch needs to work reliably in the cold, stand up to outdoor use, last through your planned sessions, respond to gloved hands and support the way you train. Here's what to check across battery life, display and controls, GPS and navigation, and training data. Battery Life and Operating Temperature Cold weather shortens real-world battery life, so check two numbers before you buy: battery life in GPS mode and the manufacturer's operating temperature range. Make sure that range covers the coldest days where you live. Both figures are usually listed on the product specifications page, or a sales associate can confirm them in store. If you run long on weekends or head onto the trails, choose a model with extra GPS battery in reserve so long sessions finish with charge to spare. Readable Display and Glove-Friendly Controls Gloves keep your hands warm but make touchscreens awkward. Switching data screens, pausing a workout or checking your pace should take a single press with your gloves on. Look for physical buttons or a crown that handle the most common actions. Readability matters just as much. Look for large, clear data fields, screens that are quick to scroll through and a display that stays legible from low winter sun to pre-dawn darkness. GPS Tracking, Route Planning and Navigation GPS records your distance, pace and route. If you mostly run familiar loops, prioritize stable positioning and clean track recording. If you explore new routes or run trails, also check for route import, offline maps and on-watch navigation. Snow and ice can turn a familiar road into one you'd rather avoid, so plans may need to change at short notice. Look for watches or companion apps that show popular nearby routes and recent condition reports from other runners, so you can check what's out there and plan a suitable route before you leave. Once you're running, offline maps and on-watch navigation show where you are and which way to go, making it easy to reroute around a bad stretch. Heart Rate Tracking and Running Performance Metrics Heart rate is one of the most common ways to gauge running intensity. In the cold, reduced blood flow to the wrist can make optical wrist readings less consistent. If you train by heart rate zones or want steadier, more responsive data, pair your watch with a chest strap, and check that the watch supports external heart rate sensors before you buy. Beyond heart rate, look for metrics such as pace, cadence, running power and VO₂ Max. Each gives a different view of your running, so you can judge your training on more than pace alone. Training Load and Recovery Trends If you follow a training plan or are building toward a race, training load and recovery data become especially useful. Look for training load, recovery analysis, HRV and sleep tracking to see how much you've done recently and how well you're absorbing it. Winter weather and road conditions can upend a planned week. A watch and app that show training trends over several weeks help you see how your load is changing and adjust upcoming sessions to match your recovery. Choose a Suunto Watch for Your Winter Running Suunto sports watches cover everything from everyday road running to trail running and outdoor adventure, with each model balancing battery, navigation and training features differently. Measured against the criteria above, Suunto Run 2 and Suunto Race 3S both cover the essentials for everyday winter running. Here's how they compare on fit, GPS battery life, navigation and training tools, and which differences matter in practice. Suunto Run 2: For Everyday Running and Marathon Training The Suunto Run 2 is a good fit for runners who primarily run on roads, want to maintain a consistent training routine, or are preparing for a marathon. It combines a lightweight design with running-specific tools to support everything from everyday workouts to race day. Lightweight fit: The watch weighs 35 g, or approximately 53 g with the official silicone strap. Its lightweight design makes it comfortable for everyday running and convenient to wear after workouts to track all-day activity and sleep. Battery life for everyday training: It offers up to approximately 24 hours of battery life in dual-band GPS mode and around 10 days of everyday use. For runners who primarily run on roads, this battery capacity will generally cover regular workouts and longer weekend runs, even allowing for some potential battery loss in cold weather, reducing the need for frequent charging. Pacing and race tools: Marathon Mode, exclusive to the Run series, brings key marathon data together in one view. Ghost Runner provides a virtual pacing reference to help you see how your pace compares with your target, while Marathon Time updates your estimated finish time. These tools are useful not only on race day but also for managing pace and evaluating goals during marathon training. Suunto Race 3S: For Trail Running and Multisport Training The Suunto Race 3S is a good choice for users who want to combine everyday road running with trail running and other sports. It brings together longer GPS battery life, outdoor navigation, and training management tools in one watch. Longer GPS battery life: It offers up to 38 hours in dual-band GPS mode, providing more battery capacity than the Run 2's 24 hours. This makes it suitable for longer trail runs and extended outdoor training sessions, supporting longer periods of continuous activity and reducing the need for frequent charging. Multisport modes: With more than 120 sport modes, it covers running, cycling, swimming, and a wide range of indoor and outdoor activities. If your training extends beyond running, you can select the corresponding mode for each activity and keep your training data organized in one place. SuuntoPlus feature extensions: SuuntoPlus lets you add sport apps and training guidance, allowing you to expand the watch's capabilities based on your training goals and activity needs. Suunto AI Coach insights: Suunto AI Coach can use your training records, sleep, HRV, recovery, and training load to provide personalized training suggestions. For example, if bad weather or schedule changes disrupt a planned workout, or you don't feel up to completing the scheduled session, you can ask AI Coach how to adjust your upcoming training. What Do Suunto Run 2 and Race 3S Have in Common? Beyond their individual strengths, the Suunto Run 2 and Suunto Race 3S also share several features that make them suitable for outdoor activities in winter: Operating temperature range: Both watches have an official operating temperature range of −20°C to +55°C, making them suitable for outdoor running and everyday activities in colder conditions. Dual-band GPS and route navigation: Both support dual-band GPS, offline maps, and route navigation to help you record workouts, confirm your location, and follow your route. If you regularly explore new routes or go trail running, Climb Guidance can also help you anticipate elevation changes along the route, including ascents and descents. High-brightness AMOLED display: Both watches feature a 1.32-inch AMOLED display with a resolution of 466 × 466 pixels and a peak global brightness of up to 2,000 nits. The high brightness helps keep workout data visible outdoors in bright conditions, while the sharp display makes information easy to read at a glance while running. Training and recovery tracking: Both provide data on training load, HRV, sleep, and recovery, helping runners monitor their training and rest over time. Winter weather can affect training frequency and intensity, and these historical trends can help inform future training decisions. EnergySense endurance assessment: Estimates your remaining endurance during a run, helping you understand your current energy expenditure and make more informed decisions about pacing and effort distribution over longer distances. Offline music playback: Both support storing music directly on the watch and playing it through Bluetooth headphones. When running alone on a winter morning or evening, you can listen to music without carrying your phone, reducing the number of items you need to bring along. If you also enjoy hiking or extended outdoor adventures beyond everyday running, consider the Suunto Vertical 2. It offers up to 65 hours of battery life in its most accurate GPS mode, along with offline maps, navigation tools, and a built-in LED flashlight to support longer outdoor activities. Practical Tips for Running Outdoors in Winter When running outdoors in winter, it's worth paying attention to both your pre-run preparation and the details of your workout. From choosing the right clothing and warming up to staying safe on your route and adjusting workout intensity, the following tips can help you handle the demands of running in cold weather. Dress in Layers and Protect Your Extremities Layering is the most practical approach. Start with a moisture-wicking base layer, add an insulating mid layer to suit the conditions, and finish with a windproof or waterproof shell against wind, rain and snow. Protect your hands, head and ears with running gloves and a hat, and choose warm socks. Dress to feel slightly cool when you start. Your body heats up quickly once you're moving, and too many layers lead to heavy sweating. Damp clothing chills you fast once you finish or slow down. Warm Up and Start at an Easy Effort Give yourself a longer warm-up in the cold so your body can adjust gradually. Start with dynamic movements, then walk briskly or jog easily to raise your body temperature before settling into your planned pace. Once you're running, build into your target pace gradually. This matters most before a tempo run or interval session. Start easy and pick up the pace once you're warm, so the hard efforts land on a body that's ready for them. Plan for Darkness and Changing Route Conditions Short winter days mean low light on morning and evening runs, making it harder for you to see the path and for others to see you. Stick to familiar, well-lit routes where you can, and wear running gear with reflective details. If your route takes you through darker stretches, a headlamp lights the way ahead. Let the day's weather shape your route. Snow, ice and standing water change how safe a road is, even one you know well. Check the forecast and route conditions before you go, and choose routes that make it easy to cut the run short or turn back early. If you meet ice or a particularly slippery section, take another route or call the run early. Let Effort Set the Pace Cold, wind and footing all affect pace. Running into a headwind or across slick ground slows you down even at the same effort. Let your breathing, how you feel and the surface underfoot guide your speed, and treat your planned pace as a guide for the day. When conditions turn rough, slow down, shorten the distance or swap a planned speed session for an easy run. If you cut a run short or skip it, let the missed miles go and pick up your plan at the next session, adjusting the week around how you feel and what the forecast holds. Takeaways Choose a winter running watch around the sessions you do most, then make sure it supports everything else you do through the year. Whether you pick Suunto Run 2 or Race 3S, look for features that fit your training habits and stay useful in every season. With the right gear and a plan that flexes with the weather and how you feel, running stays a consistent part of your life all winter long. FAQ Is Running in Winter Good for You? Absolutely. Cool conditions reduce the heat stress that comes with running in hot weather, which helps many runners hold a steady effort. Running through winter also keeps your training consistent and maintains your aerobic fitness year-round. Adjust each session to the weather, footing and how you feel, dress for the conditions and warm up thoroughly. Does Cold Weather Affect Suunto Watch Battery Life? Yes. Cold temperatures can reduce your watch's actual battery life. GPS mode, an always-on display, and other feature settings can also affect power consumption. Before a long winter workout, make sure your watch is fully charged and allow some extra battery capacity. Can You Wear a Suunto Watch in Freezing Temperatures? Yes! Suunto watches are designed to operate in below-freezing temperatures. However, laboratory testing conditions may differ from real-world use, and factors such as temperature, usage patterns, and feature settings can all affect actual watch performance.