stability 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:  stability ball
Part of Speech:  n
Definition:  any of variously sized large balls used for doing exercises and for physical therapy
Example:  The stability ball is also called a balance ball, birth ball, body ball, exercise ball, fitness ball, gym ball, gymnastic ball, physioball, sports ball, Swedish ball, or therapy ball.
Etymology:  1995
Dictionary.com's 21st Century Lexicon
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