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>For example, a 185-lb man burns about 156 calories an hour doing normal desk work, Harvard Health Publications states. Adding a stability ball boosts that by 6%, to 165 calories per hour, or about 75 extra calories per eight-hour day—which adds up to 19,500 calories a year.
>But here’s a heads-up: Studies show that sitting full-time on a stability ball can cause back strain and bad posture, and lessen circulation, so we advise using it sometimes, not all the time.