i have been working out for 1 and 1/2 years and my biceps havent grown very much but my pecs came right out. but i have a friend who has only been working out for 7 months and his arms are so much bigger than mine. so much bigger. not only that but he is more ripped and overall muscular than i am..why is that? am i doing something wrong..i get all my workouts from this site and i do them to the best of my ability..i mean my diet isn't all their but i feel like its maybe genetics.