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isometrics

noun

iso·​met·​rics ˌī-sə-ˈme-triks How to pronounce isometrics (audio)
plural in form but singular or plural in construction
: exercise or a system of exercises in which opposing muscles are so contracted that there is little shortening but a great increase in tone of muscle fibers involved

Word History

First Known Use

1962, in the meaning defined above

Time Traveler
The first known use of isometrics was in 1962

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