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( Isometric exercise)
Isometric exercise or "isometrics" are a type of strength training in which the joint angle and muscle length do not change during contraction (compared to concentric or eccentric contractions, called isotonic movements). Isometrics are done in static positions, rather than being dynamic through a range of motion. The joint and muscle are either worked against an immovable force (overcoming isometric) or are held in a static position while opposed by resistance (yielding isometric). Resistance in isometric exercises typically involve contractions of the muscle using Depending on the goal of the exercise, the exertion can be maximal, or sub-maximal. Isometrics are thousands of years old and examples can be found in the static holds in certain branches of yoga or Chinese martial arts.
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