trampoline
Trampoline (Trampoline) is an exercise equipment that stretches a stretchy elastic cloth on a rectangular or round frame and is fixed with a rubber cable or a spring. When a person repeats leaping on this, it is possible to jump to several times as high as when not using a trampoline due to repulsive force. Origin is said to be a medieval circus, but since 1930 's, it was introduced to Japan in 1959 (Showa 34) since it was popularized as a sport. It is now widely used for recreation, competition, exercise, training for other exercise types, and is being enjoyed widely. In the Olympic Games, the trampoline competition has become an official event from the 2000 Sydney Olympic Games. ...