Yeah, he said insulin was most effective when you're at low bodyfat, and the T3 isn't in there for size, it's to keep you from becoming too fat while on insulin
So to become a pro do you need a fast metabolism? -not trying to sound like a smartass or anything i'm sincerely asking
It sure doesn't hurt, but it can be done without it...although I would think super slow would make it near imposable since you have to eat big to get big.
A good example of someone with out a super fast metabolism. New pro Evan Centopani. He does not have a super fast metabolism at all, but he's revamped it as best he can, and earned his pro card.