Dick Van Dyke's fitness routine has Rick Springfield in awe. In a Sept. 26 Instagram post, the "Jessie's Girl" singer posed with the "Mary Poppins" star, who turns 100 Dec. 13, in the gym as the two ...

The quadriceps, or quads, are a group of four muscles on the front of the thigh. They are some of the largest and strongest muscles in the body. The quad muscles allow a person to stand, walk, run, ...

You have 20 muscles in your forearm, the part of your arm between your elbow and your hand. They help you move your elbows, wrists, hands, and fingers and perform many of the tasks of daily life. You ...

If you've spent any time lifting weights, you've probably noticed your muscles looking noticeably bigger during or right after a workout. It's a satisfying reminder that you actually did something, ...

The shoulder muscles are responsible for maintaining the widest range of motion of any joint in your body. This flexibility is also what makes the shoulder prone to instability and injury. Muscles, ...

Muscle knots are highly irritated muscle fibers that have tightened into a ball in one area of your muscle. These painful, tender spots can feel sore and often occur in your upper back, shoulders, or ...