View this interactive chart on Fortune.com Smartwatches ... that you have too low of a heart rate that needs to be raised.” ...

If you go outside this range, you experience either of ... Other variables could affect your heart rate, such as: Here is a chart showing how the normal resting heart rate changes with age ...

While a normal resting heart rate for adults ranges from 60 to 100 beats per minute, anything over or under this implies all ...