Quote Originally Posted by djgreen View Post
I have built muscle and lost fat at the same time but 15kg of muscle is very excessive in 6 months for a 15 yo either he is taking steroids or he is lying. unless like nach said he is a genetic freak but those are rare
Very rare(but exist :P) - I've done the same but I was on lol - but after that cycle - I've actually grown more(bf about the same if not a tad higher) but I gained 20+lbs and dropped about 4% bf) it's doable but rare - especially as dj stated 15kg = 33lbs that's a lot w/out help - or he knows how to eat and grow at 15-16(another rarity)