A trampoline is a device consisting of a piece of taut, strong fabric stretched over a steel frame using many coiled springs.

The steel can be made to fold up for transportation. 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. Organized clubs and gyms usually have large safety end-decks with foam pads at each end, and spotters are placed alongside the trampoline to try to break the fall of any athlete who loses control and falls. People bounce on trampolines for recreational and competitive purposes. For different purposes, trampoline can differ at construction, size and shape.

Trampolines for home use are less sturdily constructed than competitive ones and their springs are weaker. They may be of various shapes, though most are circular, octagonal or rectangular. The fabric is usually a waterproof canvas or woven polypropylene material.

They are usually made using coiled steel springs to provide the rebounding force, but spring-free trampolines also exist.

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