The three main types of isometric exercise are isometric presses, pulls, and holds. This is in contrast to isotonic contractions, in which the contraction strength does not change, though the muscle length and joint angle do. The term "isometric" combines the Greek words isos (equal) and -metria (measuring), meaning that in these exercises the length of the muscle and the angle of the joint do not change, though contraction strength may be varied. The 'side plank' is a variation designed to strengthen the muscles on the side of the core, such as the obliques.Īn isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint.
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