When you hop, run or jump, your legs behave like springs, absorbing and returning energy with each step. But what happens to your muscles and tendons to make this possible? Associate Professor Daisuke ...

But, working your legs can also increase the release of human growth hormone and testosterone, both of which are important for repairing muscles and helping them grow. This workout by fitness ...

In our leg, if the muscle on the back of our thigh contracts ... This short film is from the BBC series, Biological processes of the human body. You could get a skeleton model and connect rubber ...