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Title: 55 cm = great chair height for me
Review: I have been getting back aches ever since I began to sit a lot for work. I got this ball and use it for a chair, and my back aches went away. I also noticed a flatter stomach!! I have a low desk and this ball is perfect for me to sit on. If you have a standard size desk a 65cm ball may be better. Also fast shipping. :)
