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2. Trampoline - Wikipedia

   en.wikipedia.org/wiki/Trampoline

   The trampoline bed is rectangular 4.28 by 2.14 metres (14 ft 1 in × 7 ft 0 in) in size fitted into the 5.05 by 2.91 metres (17 ft × 10 ft) frame [10] with around 110 steel springs (the actual number may vary by manufacturer). The bed is made of a strong fabric that can be woven from webbing, which is the most commonly used material.

3. Donald Wallace Gordon - Wikipedia

   en.wikipedia.org/wiki/Donald_Wallace_Gordon

   The design was a radical departure from the Spaceball game he had licensed from Nissen, the primary difference was safety. Despite the great safety record, excessive litigation from every bump and scrape led to the discontinuing of the single trampoline design and the emergence of Aeroball with individual trampolines a few years later. [14] [15 ...

4. Springfree Trampoline - Wikipedia

   en.wikipedia.org/wiki/Springfree_Trampoline

   The Springfree trampoline's design includes the use of glass-reinforced plastic rods articulating below the jumping surface, as opposed to the radiating steel spring coils of a Nissen trampoline. The jumping surface is lowered around 450mm below the jumping surface of a traditional trampoline, and the base's rigidity is derived from a tubular ...

5. Trampolining - Wikipedia

   en.wikipedia.org/wiki/Trampolining

   Trampolining or trampoline gymnastics [1] is a competitive Olympic sport in which athletes perform acrobatics while bouncing on a trampoline. [2] In competition, these can include simple jumps in the straight, pike, tuck, or straddle position to more complex combinations of forward and/or backward somersaults and twists.

6. Glossary of gymnastics terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_gymnastics_terms

   Situation on floor exercise or vault when a gymnast crosses the line indicating the border of the mat, resulting in a score deduction. Onodi A backhandspring with a half turn mid air, in which a gymnast finishes with a front walkover. One-handed cartwheel A regular cartwheel is performed, but one hand is placed and kept behind the back.

7. Tatami - Wikipedia

   en.wikipedia.org/wiki/Tatami

   A half mat is called a hanjō (半畳), and a mat of three-quarter length is called a daimedatami (大目畳 or 台目畳), which is used in tea-ceremony rooms . [ 4 ] In Japan, the size of a room is usually measured in relation to the size of tatami mats ( -畳 , -jō ) , about 1.653 m 2 (17.79 sq ft) for a standard Nagoya-size tatami.