How a trampoline improves your flexibility Which muscles work on trampolines?Jumping on a trampoline trains the whole body and the g-force generated by the jump helps to build muscles and burn fat faster. The trampoline muscles include the legs, feet, arms, thighs and abdomen. It also has the added benefit of improving agility and balance. The muscles in your leg must work hard to withstand the force of gravity and push you into the...