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 dynamic/isotonic movements). Isometrics are done in static positions, rather than being dynamic through a range of motion.
Read more about Isometric Exercise: Overcoming Versus Yielding, Definition, Isometric Resistance, History, Medical Uses, Comparison With Dynamic Exercises, NASA Studies
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