stability ball

exercise ball

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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To stability ball'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's 21st Century Lexicon
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