While a heavy bag workout is de rigueur for boxers to improve hitting technique and power as well as to build stamina, it can really be useful even for non-boxers. Typically the heavy bag is constructed out of leather or vinyl, and weighs about 40 to 100 pounds; an uncomplicated item that can be hugely [...]
Source: http://www.fitnesshealthzone.com/body-building/heavy-bag-workout/
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