The range above is for moderate to intense physical activity for adults 18 to 64, which assumes a maintained target heart rate between 60 and 80% of the maximum heart rate. Maximum heart rate is calculated by a median based on age, gender, and activity level, or a known resting heart rate. Generally, a lower resting heart rate is linked to better cardiovascular health.

If you have a health condition or are considering changes to your physical activity, talk to your doctor before starting a new exercise program.