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

The arm extends from the shoulder to the wrist, including the upper arm and forearm. Different muscles may work together in intricate ways to help the arm, wrists, fingers, and hands function. Knowing ...

Working out doesn't just build muscle but, in later life, helps maintain a powerful cellular machine that repairs damaged ...

Neck muscles have an essential role in supporting and stabilizing your neck. More than 20 muscles are working to keep your head supported and moving. Your neck muscles have a range of responsibilities ...

What Is the Psoas Muscle? The psoas (pronounced so-ezz) muscles are two large muscles in your lower back. You have one on either side of your spine. They're the main muscular connection between your ...

Evolution has left humans with many vestigial traits—remnants of once-useful biological features that serve little or no modern purpose. One such example is the muscles around our ears, which in many ...