Suunto 3, Suunto 5, Suunto 5 Peak, Suunto 9, Suunto 9 Baro, Suunto 9 Peak   and   Suunto 9 Peak Pro   have the following fitness features provided by   Firstbeat analytics .

You can read more about it here: 

• Fitness level     (VO2 max.) - from   running   and   walking   sports  

• Sleep quality   assessment

• Stress level

• Body resources

• Fitness age

You can also check the   user guide   of your Suunto watch under the   Features   section for   Fitness level ,   Sleep tracking   and   Stress and recovery . 

Happy training!