Over the last few thousand years our lifestyles have changed significantly. We used to have to run to catch our food and to avoid being caught by predators. Now we exercise very little and our fitness levels have become quite low. Gymnasts and athletes need stamina, speed and strength. Strength and speed are also important in our daily lives. Regular exercise is needed to get fit and stay healthy.

This clip is from:
Science Clips, Keeping Healthy
First broadcast:
28 April 2009

This clip can be used to stimulate discussion about the importance of exercise for keeping fit. Ask the children to try and explain why it's important to exercise. The clip could be asked to make a diary of the physical exercise they do each day. Compile a class graph to show the different sports children take part in to keep fit.