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krustus said:i got this trx type strap...cheaper and better imho... not a mass builder of course but a great fitness tool... combine with body weight stuff... jumps...and running... you can get a very decent workout
http://www.lifelinefitness.com/store//products/ProductDetail.php?ProductID=684
You really need to be careful with those. Using them could cause you to run, jump and do things that could be considered cardio.
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