ANSWERS: 2
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You need to seek the advise of a professional trainer who is experienced with people your age. You can find some advice on-line, but I think a better choice would be to ask your medical provider for a referral.
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Eat properly and get enough sleep. The weights aren't going to mess you up. There's a reason they call them "growth spurts." My uncle didn't grow at all in high school, but added 4 inches freshman year in college. BTW don't do the same exercises with that dumbell every day. Your muscles need a day or two to recover if you want them to grow.
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