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, ...

A new study from Dartmouth College sheds light on how easy to moderate aerobic exercise affects the human mind differently than high-intensity workouts over a full calendar year. This ...

It feels good to push the body to the point of exhaustion. Leaving the gym or a fitness class soaked with sweat is a deeply satisfying manifestation of the endorphins humming around in your brain.