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

Children could learn key vocabulary from the clip such as muscle, skeleton, contract and relax, using a drama activity where they think of a corresponding action for each word and act them out when it is said. After watching the clip children could undertake a range of activities, such as walking, playing sport and working in class and think about where on their body they are using muscles. Children could use face paints or similar skin friendly markers to draw on their skeleton and muscles on their legs.