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 ...

Exercises to build arm muscles. Curls can be done with dumbbells, a barbell, or a machine. Choose a weight you can lift 8 to 12 times in a row. If you use dumbbells or a barbell, make sure you ...

You’ll also be able to interact and see layers of your arm muscles in a 3-D diagram. Your arm muscles allow you to perform hundreds of everyday movements, from making a fist to bending your thumb.