Isometric exercise or 'isometrics' are a type of strength training in which the resistance is provided by an immovable object rather than a weight, elastic or hydraulic resistance. During an isometric contraction the length of the muscle does not change (compared to concentric or eccentric contractions, called isotonic movements) and the joint angle does not change. As there is no movement, isometrics are done in static positions, rather than being dynamic.
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