High-intensity interval training is important, but coming back to your breath can be crucial to helping you train.

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, ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? There’s a lot to love about lifting heavy weights: It helps you build ...