"To be quite frank, I cannot see any advantage or reason for a person to be using an exercise ball as an office chair," says Jack P. Callaghan, the Canada Research Chair in Spine Biomechanics and Injury Prevention at the University of Waterloo in Ontario, in an interview with the New York Times.
Callaghan and his colleagues recently performed a study in which they asked 14 participants to sit alternately in a standard office chair and on an exercise ball, while measuring the activation of eight muscles and the position of the lumbar spine.
Not only did they not see any advantage in terms of muscle activity or posture, but the exercise ball "increased perceived discomfort." In other words, sitting on an exercise ball instead of a chair is a pain in the rear and looks funny, but probably won't benefit your health all that much.
On the other hand, as Tracie Egan Morrissey points out on Jezebel, giggling burns off eight calories, so if you sit on an exercise ball, at least your coworkers' health might improve.
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