Supercharge Your Body: Fitness Circuits

Imagine you want to get better at football. Should you only kick a ball? What about your legs — do they need to be strong? What about your lungs — do they need to keep going without getting tired? What about your speed when you chase the ball? Here is the challenge: one exercise alone cannot train your whole body. So how do athletes make sure every part gets better? That is exactly what you are about to find out.