Skeletons can be remarkably flexible but muscles are needed to move them. Various sports competitors and athletes are seen in action using their muscles. Muscles are used every time we move. There are more than 600 muscles in the human body. Muscles are attached to the bone by tendons and work in pairs to allow for smooth movement. To move a joint, one muscle contracts while the other muscle relaxes and becomes longer.

First broadcast:
8 October 2007

This clip can be used as a stimulus to display how the body moves. Teachers could use this clip to show the movements of the body in different situations. Children could perform different movements and explain where they think their body is moving and what muscles they might need.