exercise ball
noun/ˈeksəsaɪz bɔːl/
/ˈeksərsaɪz bɔːl/
(also Swiss ball™
/ˈswɪs bɔːl/
/ˈswɪs bɔːl/
)(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
健身球 - Sit upright on the exercise ball with your feet flat on the floor.
直立坐在健身球上，双脚平放在地板上。
- Sit upright on the exercise ball with your feet flat on the floor.