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Aerobic exercisers designed to provide exercise by bouncing on a resilient (elastic) surface. Trampolines usually consist of a woven mat attached by coiled steel springs to a metal frame providing a rebounding force. Trampoline mats are usually round, but some are oval, rectangular, or other shapes. Bouncing trampolines are used in sports (e.g., diving, gymnastics, skiing) and in physical fitness exercises; they are intended to increase cardiovascular endurance by keeping the heart and pulmonary rate elevated for a continuous time. Additionally, they provide muscular strength and endurance mainly to the lower body muscles (e.g., quadriceps, hamstrings, gluteus, hip flexors, calves) and also to the arm and abdominal muscles.
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