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, ...

If you work out regularly—or even just once in a while—you’re probably familiar with hitting “the wall.” Hitting the wall can happen when you’re out for a jog and finishing the rest of your planned ...

Finding the right balance for your workout intensity can help you make more progress in less time. There are signs a workout is needlessly hard, such as excessive exhaustion or a certain kind of pain.

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