isometric exercise

noun
1.
exercise or a program of exercises to strengthen specific muscles or shape the figure by pitting one muscle or part of the body against another or against an immovable object in a strong but motionless action, as by pressing the fist of one hand against the palm of the other or against a desk.
2.
any specific exercise of this type.

Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

isometric exercise n.
Exercise performed by the exertion of effort against a resistance that strengthens and tones the muscle without changing the length of the muscle fibers.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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