Here’s one of those weird-yet-fascinating, quirky-yet-perhaps-helpful research findings: People who clench their muscles—by, say, making a fist or tensing their biceps—show a brief spurt of improved ...

Still dealing with a tight hip or weak glute—despite all the foam rolling, stretching, and strengthening? Or, maybe you’ve had an injury that keeps flaring up, even though you thought it was finally ...

One of Dara Torres’ trainers is walking all over me. Literally. I’m lying on my stomach as Steve Sierra concentrates his entire 160 lb. (75 kg) on my glutes and hamstrings. It hurts, but in a good way ...