a firm, very large, usually inflatable ball used in various exercises, chiefly to strengthen the back, pelvis, and abdominal muscles.
- Also called stability ball, balance ball, fitness ball .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use exercise ball in a sentence
Place one heel on top of an exercise ball and raise your other leg straight up, slightly bending your knee.
If you sit all day, consider swapping your desk chair for an exercise ball, or take phone calls pacing around your office.