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 ...

There is perhaps no better way to see the absolute pinnacle of human athletic abilities than by watching the Olympics. But at the Olympics – and at almost all professional sporting events – you rarely ...

The muscular system works to control the movement of our body and internal organs. Muscle tissue contains something called muscle fibers. Muscle fibers consist of a single muscle cell. They help to ...