exercise ball
noun/ˈeksəsaɪz bɔːl/
/ˈeksərsaɪz bɔːl/
(also Swiss ball™)
(North American English also stability ball)
- a large ball that you can sit on when doing exercises to make your muscles work in a different way
- Sit upright on the exercise ball with your feet flat on the floor.
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exercise ball