It's not just genetics, it's how you train too, you should never ''squeeze'' the arm muscles very tight, rather let the weight do the pumping, like Arnold did, or Krizo, just let the muscle grow. Once you start ''squeezing'' the muscle really tight the arm muscles will become extremely dense and won't grow anymore
Oh look the board fucking retard just added some more retard wisdom to go with his usual fucking retard posts. Your posts are so retarded, they actually push Matt C off the spectrum. Nobody could possibly squeeze more fucking retardation into two words as you. If you starred in a netflix political series starring Kevin Spacey, it would be called House of Tards. Take your tard posts and fuck the fuck off this forum, tard.