Your tricep muscles contract and pull, while your bicep muscles relax, causing your arm to straighten back out. You can find antagonistic pairs in your legs too. Just extend and curl and see which ...

Located around the shoulder joint, this group of muscles and tendons connect the upper arm bone to the shoulder blade. They're responsible for your shoulder mobility and stability, so it's ...

keeping your upper arm and elbow still. The wrist extensors are a group of muscles that are responsible for bending your wrist, as when making the hand signal for “stop.” These small muscles ...