A new wave of research is showing what the old gym myths about stretching got wrong—and what you really need to do to reap its benefits.

While many of us think about stretching as something to do after a run or a strength-training session, lower-impact activities like walking can cause muscle stiffness or soreness, too. Even shorter ...

I interview trainers regularly as part of my job. Often, when an exercise comes up repeatedly and is recommended by multiple experts, I’ll end up trying it for myself. This is exactly what happened ...