I'll go one further and tell you why its not possible. John Cena (and others like him) has gone past his natural genetic limit. We all have a genetic limit that dictates exactly what size our individual muscles will be. Thats due to the number of muscle fibers we are born with. Muscles will only get so big naturaly because it takes energy to keep those muscles. The human body is built with an inate sense of preservation and it sees no reason to get naturaly bigger than it has too because it will then require more energy ( ie, food) in order to maintain. You have to use steroids to go past your genetic limit. And even when you do, you have to keep taking them to look like that.
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"I watched Brokeback Mountain and that one scene made me want some meat." -- Mighty Mouse.
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