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I guess what I've always heard to find a weight that fatigues the muscles in 8-12 reps. So, if you are capable of doing 20 reps at the weight your using, add more. If you're only cable of doing 5, take some off. Once you find that weight, do as many sets are you care to. If you're just starting our you might want to go easy for awhile (a weight you can do 15 to 20 reps, for instance) to ease yourself into it.
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