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, ...

Since there is no one-size-fits-all approach to exercise, it helps to have a personalized rating system that allows you to keep track of your own workout. After all, a casual jog for one person might ...

The debate about how hard to push during exercise has persisted for decades, with fitness approaches swinging between high-intensity interval training and gentler, steady-state activities. However, ...

This encyclopedic article explains how prolonged inactivity affects cardiovascular, muscular, and connective tissue systems ...

The ‘talk test’ is an ideal way to gauge your effort. The reason you can still chat while running at easy pace is because you ...

Watch says you’re in the red but body feels fine? You’re not imagining it. Discover why 220 minus age fails women and how to rethink heart rate zone training.