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It really would depend on what exercise you're actually doing with the dumbbell. 20 lbs is pretty heavy for a person just beginning weight lifting. Be sure that you've been trained how to properly do whatever exercise. Maintaining proper form during an exercise is critical to increasing muscle mass- if you aren't exercising the proper muscle group, you can't expect to see gains. You might want to consider purchasing an adjustable dumbbell, which will let you adjust the weight you're using to a particular exercise. Also, as you improve, you'll be able to increase the weight you're using without having to go out and buy another dumbbell.

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15y ago
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13y ago

you should do about 20 reps a day. i am 12 and i do 15, and i also move 100lb. hay bales daily. work yourself but don't hurt yourself. and make sure that you start slow and work your muscles up

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15y ago

until you can't do anymore. good luck.

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Q: How much reps and sets should a 14 year old do with a 20 lb dumbell?
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