In 1911 Albert Einstein stated if we could some how line up the 3 forces of acceleration, deceleration and gravity in a vertical plane, we would create the best exercise for the cells of the human body. No exercises met this definition until rebound exercise was developed.
What happens when you are bouncing up and down on the rebounder; at the bottom of every bounce, every cell of the body is stimulated by the combination of three forces; acceleration, deceleration and gravity. Just as importantly at the bottom of the bounce, your body weight increases two times your body weight (2 g forces) at the top of the bounce you are weightless.