/\Agreed. Look at Tiger Woods. Back in 1997, he was a scrawny, albeit highly talented golfer. Fast-forward 10 years, and he's built Ford tough, wearing Spider-Man shirts and has some mean pythons for arms. Still wears the same hats, though the logos change for Nike, the Sumo driver, etc. He's bulked up without using the juice, keeping the game of golf clean in the process.
Barry Bonds has also grown rather exponentially from the past ten years, though more concentrated around his belly. I'd let that slide, but not the size of his head. Your head, as far as I can tell, does not grow nearly as fast as the rest of your body, and in Bonds' case, it's grown a complete full size in the span of, what, 3 years? Preposterous.