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Your arms will get bigger the more you use them. Do lots of pull-ups, look up variations on the pull-up to keep things interesting. One rule of thumb is if you do reps fast you build muscle strength, if you do them slowly you build both strength and mass. But that doesn't work for everyone all the time. You could consider getting a PT to work with you specifically. But none of it will work if you don't also eat well, drink lots of water and most of all sleep well.
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