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Title: Research this thoroughly before you buy one for an office chair
Review: I bought this ball to use as an office chair without reading up enough on the matter. I thought it would burn calories and improve posture, but as it turns out the ball really doesn't do much of either. An article at the N Y Times said that according to a 2008 study, performing clerical work at a desk while sitting on an exercise ball burns about four more calories an hour than the same activity in a chair, or roughly only 30 extra calories in a typical workday. And a Dutch study found that the disadvantages, including spinal shrinkage, may outweigh any advantages. All I know is that my back and hip joints hurt after I used this, and the ball didn't work out as an office chair. It might be fine if you want it for other exercise, but that wasn't what I purchased it for.
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