A trampoline is a device consisting of a piece of taut, strong fabric stretched between a steel frame using many coiled springs. Not all trampolines have springs. People bounce on trampolines for recreational and competitive purposes. The fabric that users bounce on is not elastic itself; the elasticity is provided by the springs that connect it to the frame, which store potential energy.
Kids learn their centre of balance. Bouncing on a trampoline creates a constantly shifting centre of gravity, which kids must quickly respond to by adjusting their positions and bilateral movements. Jumping on a trampoline gets your blood pumping and works your lymphatic system, which strengthens your immune system and promotes proper body circulation. Since bouncing is considered low-impact it's also safer and less strenuous on the joints than other forms of exercise.
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