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Just a little tid bit about these balls.
At work I was getting back aches from sitting at my desk all day. Some one suggested that I get one of those balls and use it to sit on at work when my back was hurting. It works really well for making you keep your posture and in turn keeps my back from hurting a lot. I don't use it all the time just when I am sitting in front of my computer for umpteen hours
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