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exercise ball

noun
1.
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for exercise ball
noun

any of various large balls used in exercise routines or physical therapy

Examples

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.

Word Origin

1907

Dictionary.com's 21st Century Lexicon
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Word Value for exercise

17
18
Scrabble Words With Friends