Wow 13 YO, I'm 33 YO and your bicep is huge compared to mine. It is 4 inches bigger, that is a LOT of muscle. Kid you could pick my scrawny little bod up and throw me clear across the room! You would wipe me out in a fight!
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i am 12 but i am large not tall or fat just muscular unflexed my biceps are 12 inches but when they are flexed they are thirteen inches not to "flex" on anyone
I'm 33YO and your bicep is huge compared to me, yours is 4 inches larger, that is a LOT of muscle.