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Short answer - it will depend on your body system. I grew up with two friends (one premie; one fast matabolism) who worked out like big dogs. Both got strong as big dogs. Neither had any (real?) muscle mass. So if you didn't know them, you might be tempted to mess w/them. Odds are - you would lose.
Basic facts - if you want to bulk up, use larger weights. Definition comes from more repetitions.
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