There's a lot of talk about lean muscle compared to bulk muscle, but experts say it's not worth differentiating the two.

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

If your fitness goal is to up the ante on endurance, pack more power into your sprint, or supercharge your strength gains in the gym, it’s worth exploring – what are the different muscle fiber types?

The back consists of large, complex muscles that support your trunk and spine. There are many types of back muscles, and they are all essential, helping you walk, bend, twist, and hold your body ...