What makes a male's arms bulkier as he grows up?!
Question: genes
testosterone
exercising
puberty
two-two has spoken
Answers: genes
testosterone
exercising
puberty
two-two has spoken
hormones (and lots of them)
also excersise
i have had this since i was like ten. and boy did it work try it out.
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Testosterone makes boys arms get bigger, also his shoulders back and pecs, some don't though and their doomed to have girlie arms for life or until they start working out.....
Testosterone.
It made me hot!