Muscle growth isn’t just about lifting weights, explained Justin Kraft, C.P.T., founder and trainer at Aspire 2 More Fitness. “It has three major contributors: strength training, proper nutrition, and ...

Repeated exercise, or wasting, can change the way key genes work.

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 ...