How do people have huge arms 24/7?

Ctrl

New member
Hey. iv been working out for a year and have considerably grown. concerning my upper arms, they will look pretty normal when relaxed but definitely much larger and defined if tensed. yet sometimes on the street etc i see people with huge defined arms 24/7 and i doubt theyre tensing it on purpose.
so how do those people get them? is it just working out alot? genetics? thanks
 
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