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Title: Ball Chair
Review: I really like this but would like a bit larger ball. I have a 55 cm ball and it is too large, the 52 cm one is a bit small. I find, if I sit properly, that I have no arm strain (no arm rests!) and no back strain. This was an ongoing problem with my regular office chair. I have just spent long hours doing date entry and no problems. I do need to get up and walk around every hour or two for a bit.
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