The peroneus longus muscle (or fibularis longus) is a major mover and stabilizer of your foot and ankle. The muscle runs down ...

Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

The plantaris muscle is a small, vestigial structure located in the posterior compartment of the leg, often noted for its slender muscle belly and long tendon. Recent anatomical investigations have ...

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 ...

Your arms contain many muscles that work together to allow you to perform all sorts of motions and tasks. Each of your arms is composed of your upper arm and forearm. Your upper arm extends from your ...

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

Everyone is familiar, at least hand-wavingly, with the distinction between slow-twitch and fast-twitch muscle-fiber types. The former are great for running marathons; the latter are ideal for ...