Trampolining is a sport which is enjoyed by gymnasts, and they perform acrobatics while jumping on a trampoline. Some of these jumps include jumps in the pike, tuck, or straddle position. Trampolining dates back to the 1890's when Billy Bouncer or John Hayes was watching trapeze performers doing tricks while bouncing on a safety net. Later on, he used trampoline as a means of entertaining his audience, he would sometimes let them participate. Trampolining in the competitive level consist of combinations of 10 contacts with the trampoline. In trampoline competitions, these three moves are usually performed: tucked, knees clasped to the chest using your hands; piked, your hands touching your feet with both your arms and legs straight; and straddle, your legs creating a triangle.