Exercise ball
a firm, very large, usually inflatable ball used in various exercises, chiefly to strengthen the back, pelvis, and abdominal muscles.
Contemporary Examples
If you sit all day, consider swapping your desk chair for an exercise ball, or take phone calls pacing around your office.
7 FitBit Hacks to Burn More Calories in 2014 Megan Humphreys January 5, 2014
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
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