Out are the days of only slogging through grueling high-intensity workouts like CrossFit and bootcamp classes day after day. Nowadays, chiller, low-impact activities, like walking, are having a moment ...

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 ...