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Tuck Jump – From a straight jump start, the knees are pulled up to the chest and the hands must at least briefly grasp the legs between the knees and ankle. Pike Jump – Again from a straight jump start, the legs are straight, held together and lifted parallel to the trampoline and the arms and body reach forwards towards the pointed toes.
The trampoline-like life nets once used by firefighters to catch people jumping out of burning buildings were invented in 1887. The 19th-century poster for Pablo Fanque's Circus Royal refers to performance on trampoline. The device is thought to have been more like a springboard than the fabric-and-coiled-springs apparatus presently in use. [1]
Although each mat may be made of different foam, they generally have similar vinyl enclosures. 14- to 18-ounce polyester laminated vinyl is usually used in all folding mat applications. The vinyl covers should be fire-retardant (class A), puncture and mildew-resistant, and antibacterial to help maintain good hygiene.
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"Each phase of the sequence included a 2-min warm-up, followed by 5 min of jumping. The four heights, measured by the distance the subjects’ feet were elevated above the trampoline bed, were 18, 37, 75, and 100 cm. A 5- to 10-min rest period was provided between each jumping level." The jump heights in inches were: 7", 14.6", 29.5" and 39.4".
For vaults in the Yurchenko family, the gymnast will put their hands onto a mat that is placed before the springboard, round-off onto the board, and do a back handspring onto the vault. The off-flight may be as simple as leaping over the apparatus or as complicated as executing several twists and turns in the air.