Trampolining is a competitive Olympic sport in which gymnasts perform acrobatics while bouncing on a trampoline. These can include simple jumps in the pike, tuck or straddle position to more complex combinations of forward or backward somersaults and twists.
There are two related competitive rebound sports, synchronized trampoline and double mini-trampoline.
In the early 1930s, George Nissen observed trapeze artistes performing tricks when bouncing off the safety net. He made the first modern trampoline in his garage to reproduce this on a smaller scale and used it to help with his diving and tumbling activities. He formed a company to build trampolines for sale and used a variant of the Spanish word trampolin (diving board) as a trademark. He used the trampoline to entertain audiences and also let them participate in his demonstrations as part of his marketing strategy. These were the beginnings of a new sport.
In the USA, trampolining was quickly introduced into school physical education programs and was also used in private entertainment centres. However, following a number of injuries and law suits caused by insufficient supervision and inadequate training, trampolining is now mostly conducted in specialist gyms with certified trainers. This has caused a large reduction in the number of competitive athletes in the United States and a consequent decline from the earlier American prominence in the sport. Elsewhere in the world the sport was most strongly adopted in Europe and former Soviet Union. Since trampolining became an Olympic sport in 2000, many more countries have started developing programs and Japan and China are already producing very competitive athletes.
In synchronized trampolining, two athletes perform exactly the same routine of ten skills at the same time on two adjacent trampolines. Each athlete is scored separately by a pair of judges for their form in the same manner as for individual competitions. Additional judges score the pair for synchronization. Fewer points are deducted for lack of synchronization if the pair are bouncing at the same height at the same time. The degree of difficulty of the routine is determined in the same way as for individual trampoline routines and the points added to the score.
A double mini-trampoline is smaller than a regulation competition trampoline. It has a sloped end and a flat bed. The gymnasts run up and jump on to the sloping end and then jump on to the flat part before dismounting on to a mat. Skills are performed during the jumps or as they dismount.
A double mini-trampoline competition consists of two types of pass. In the one, which is known as a mounter pass, the athlete performs one skill in the jump from the sloping end to the flat bed and a second skill as they dismount from the flat bed to the landing mat. In the second, which is known as a spotter pass, the athlete does a straight jump from the sloping end to the flat bed to gain height, performing one skill while landing back on the flat bed and then a second skill as they dismount. These skills are similar to those performed on a regular trampoline except that there is movement laterally along the trampoline.
The form and difficulty are judged in a similar manner as for trampolining but there are additional deductions for failing to land cleanly or landing outside a designated area on the mat.