Small anecdote: I've trained in BJJ for some time and I've seen a number of young Brazilian guys come up from Brazil to train under my professor. These guys are ALWAYS yoked up at age like 22. It can be confusing because your brain knows this isn't possibly naturally but you know these guys are living in NYC, making no money and my professor is definitely not hooking them up. I've known their roommates who say they just eat super clean and never see or heard anything about steroids. The solution? I believe these guys are taking stuff when they are teenagers in Brazil. It's very common in the country and in the sport in particular. So basically these guys get to a certain body composition, then they are able to maintain it because they're young super athletes with good habits.