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 ...

Rating of Perceived Exertion (RPE) and Reps in Reserve (RIR) are methods that adjust lifting intensity based on how hard a set feels rather than fixed weight percentages. RPE uses a 1–10 scale to ...