"Rebound Exercise is the most efficient, effective form of exercise yet devised by man." A. Carter summarized a NASA study in 1979, a study which NASA published in 1980 in the Journal of Applied Physiology.
NASA says, "...for similar levels of heart rate and oxygen consumption, the magnitude of the bio mechanical stimuli is greater with jumping on a trampoline than with running, a finding that might help identify acceleration parameters needed for the design of remedial procedures to avert deconditioning in persons exposed to weightlessness. “
When Rebounding, three natural forces are at work: gravity, acceleration and deceleration. In the up and down movement of bouncing, your body is subjected to these three forces and each time you bounce into the mat (at its deepest point) your body comes into a G-force (Gravity force) of two to three.
As a consequence, literally each cell of your body experiences a G-Force which is two or three times stronger than normally. It is as if your weight would double or triple for a fraction of a second when you hit the deepest point of the Rebounder mat. This exposure to a higher G-Force is what strengthens the body; and as it is only for a fraction of a second, this does not fatigue the body. .During the movement up to the highest point of your bounce, you come to nearly weightlessness and your body can relax completely.