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.

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

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.

You must first spend some time getting your model to relax. Then you'll get a natural expression.