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I was 16" back in high school 10 years ago and am bigger and stronger now but I haven't measured since then. Maybe 18? Bi's are relatively easy to work, just make sure you find an excercise that isolates them well, like curls of different types. Use a weight you can handle so you squeeze the muscle and don't swing the weight. Good luck and feel free to PM me for excercises if you want.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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