Etymology
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isometrics (n.)

as a type of exercise, 1962, American English, from isometric; also see -ics.

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Definitions of isometrics

isometrics (n.)
muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change);
Synonyms: isometric exercise
From wordnet.princeton.edu