You can really raise your heart rate, burn fat and tone your lower body.

You've got to be careful, because it really is hard on the knees and joints.

Their jumps are bigger, vertical and horizontal, and they are faster because of leg strength.

You should let your muscles rest.

If you have these big huge goals they are not as attainable as smaller goals. It's better to start out slow and gradually increase - that way you don't get burned out. But you've got to have a plan.

[The heart] is the household divinity which, discharging its function, nourishes, cherishes, quickens the whole body, and is indeed the foundation of life, the source of all action.