exercise ball

exercise ball

noun
a firm, very large, usually inflatable ball used in various exercises, chiefly to strengthen the back, pelvis, and abdominal muscles.
Also called stability ball, balance ball, fitness ball.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  exercise ball
Part of Speech:  n
Definition:  any of various large balls used in exercise routines or physical therapy
Example:  Exercise balls are also called balance ball, body ball, fitness ball, gym ball, physioball, Pilates ball, sports ball, stability ball, Swedish ball, Swiss ball, therapy ball, or yoga ball.
Etymology:  1907
Dictionary.com's 21st Century Lexicon
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