Kazuma Akimoto
Cena doesn't use steroids and neither does Batista. Cena couldn't have used it because they give you a urine check before you can star in a movie. And Batista was a body builder who weighed 100 more pounds than he does now that he joined WWE, all muscle. If he can work out that much, he doesn't need steroids. But I totally agree about the gimmick thing. Since most people that watch wrestling are noobs and just now getting into it, they actually follow the storylines.
Actually the reason Cena is so in shape without steroids is that he has a college degree in exercise physiology, the science of bodybuilding. He graduated for that degree with high marks and, though he may not know how to wrestle, he does know something about working out.