fitness ball
noun [ C ] uk/ˈfɪt.nəs ˌbɔːl/ us/ˈfɪt.nəs ˌbɑːl/ (also balance ball, exercise ball, stability ball, Swiss ball, yoga ball)
健身球
a large ball for sitting or lying on while exercising
Lie with the middle of your back on a fitness ball, your feet on the floor, your knees bent. 仰卧在健身球上，双脚着地，膝盖弯曲。
Fitness balls target the core muscles, and can be used to work the arms and legs as well. 健身球用于核心肌肉部位的训练，也可用于锻炼手臂和腿部。
- More examples
- I use a fitness ball to keep my back in shape.
- Rather than invest in a large, expensive gym machine, consider buying several small, economical pieces such as hand weights, medicine balls and fitness balls.
- Sit on a fitness ball and, holding a 4kg weight, raise your arm straight above your head.
- There were pictures of a woman doing various exercises using one of those giant fitness balls.