Is bicep peak all attributed to genetics? I work out with a friend of mine, who has been working out for 18 months now with me. Overall, I have more muscle than him, I probably have a lower bodyfat, as he is kinda soft, our diets dont even compare, he's lucky if he ingests 100g of protein a day, and eats like 3 little meals a day, cuz he's trying to get "cut" eats about 100g of protein a day, while Im getting 200 at the least, but yet he's developing these nice peaked biceps, while mine cant even compare to his. My cousin told me once, that it looks like I have a "long" bicep muscle, I dont know if that is a possibility, but what gives here. Im sick of him showing me his damn arms all the time.