Do these tend to do the job, if used properly, or are they a waste of time? Are general weights better?
http://www.auravita.com/products/aura/BSFT10912.asp?RefId=220&adid=BSFT10912
Suppose it`s like a version of the old chest expander but more of an all round item. I presume it works using resistance as much as anything.
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