English

Definition of exercise ball noun from the Oxford Advanced Learner's Dictionary

 

exercise ball

 noun
noun
BrE
 
; NAmE
 
(also Swiss ball™
BrE
 
; NAmE
 
)
 
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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. Swiss ball exercises make getting fit fun.
See the Oxford Advanced American Dictionary entry: exercise ball