Fitness intensity can be one of the most subjective areas of working out. From “rate of perceived exertion” (or RPE) to the famous “runner’s high” or getting “in the zone,” these metrics can, at best, ...

Once exercise becomes a regular habit, it's time to think about how much you're moving and how hard you're actually working. The Department of Health and Human Services recommends that adults get at ...

Mayo Clinic has introduced clear, research-backed methods to assess aerobic exercise intensity, including the talk test, ...