I don't know for sure, but I'm sure steroids or some sort of performance enhancer is the reason you see what you see. Honestly, when it comes to such a physical sport as football, I don't blame players for using PED's. They do so at their own risk, but also to survive the beating they take and still be able to heal and play the following week. I know it's a controversial issue in other sports, but nobody seems to care about that in the NFL.