I've recently started trampolining and trying to get a feel for the physics involved. I did a tiny bit of physics years ago, so I've got a vague idea whats going on. Could you please check my understanding. Once you leave the trampoline mat, your trajectory is set, and you could model your your path using projectile motion. So if you travel forwards during a skill, its because your were leaning during takeoff, not because of the changes in body position during the performance of the skill. In a forward tucked somersault/flip you pull yourself into a ball (Heels to butt, knees to face) and rotate, tighter the tuck more angular velocity. To stop rotating you open back out again. I believe its the same basic principle as spinning on an office chair with arm's out vs arms in, but don't really understand whats going on. Related to 1 and 2, pulling into a tuck would change your center of gravity, which I believe can change your path mid flight. If so how great is this force and in which direction does it act. Conservation of energy: When you pull into a tuck you are gaining velocity and the energy to do that is from your bodies own metabolic energy stores, ie if we ignore air resistance and assume the same force is produced by the legs each jump there's no reason why a series of straight jumps should be any higher than one involving different skills. Or to put another way, it's you getting tired and not jumping as high, nothing else. Are there any other physics involved that I'm not aware of ?