Didn't Brock work on a farm from a young age, and as a result was constantly lifting heavy shit? Also, I remember seeing a WWE made documentary about him, and he was a savage when he was young. Constantly working out, constantly lifting weights. I'm sure he probably has used PED's at some point in his career, but I firmly believe he's been blessed with ludicrous genes. The guy's not just big, he's ridiculously strong, and you don't get hands that big from steroids. The guy's a beast.