Swiss ball™
noun🔊/ˈswɪs bɔːl/
🔊/ˈswɪs bɔːl/
(also exercise 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 健身球 Swiss ball exercises make getting fit fun. 瑞士舞会让健身变得有趣。