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When the person jumps, the cord stretches and the jumper flies upwards again as the cord recoils, and continues to oscillate up and down until all the kinetic energy is dissipated.
Ice skating occurs both on specially prepared indoor and outdoor tracks, as well as on naturally occurring bodies of frozen water, such as lakes and rivers.
Most modern hang gliders are made of an aluminium alloy or composite-framed fabric ("sailing material derived from parachute fabric") wing. The pilot is ensconced in a harness suspended from the airframe, and exercises control by shifting body weight in opposition to a control frame, but other devices, including modern aircraft flight control systems, may be used.
Aside from recreation and competition, skiing has been used for military purposes and travelling in areas that experience heavy snowfall. Until about 1860 skiing was primarily used for practical transport purposes in snow-rich areas, from around 1860 skiing for recreation, exercise and competition was introduced. Many types of competitive skiing events are recognized by the International Olympic Committee, and the International Ski Federation.
Unlike other modes of diving, which rely either on breath-hold or on air pumped from the surface, scuba divers carry their own source of breathing gas, allowing them greater freedom of movement than with an air line or diver's umbilical and longer underwater endurance than breath-hold.