Have you ever stood next to an NFL player? Unless you're hitting the gym hard, it's likely that those dudes look like one of the Monstars from Space Jam next to you. But how are they able to get so jacked? Some folks believe that human growth hormone, or HGH, plays a role, however, let's be real here. When it comes to football players, they are continuously encouraged and damn near expected to get bigger, stronger and work out as a team. So, even though HGH is more difficult to detect than other performance enhancing drugs, let's give these guys the benefit of the doubt and the credit they deserve for spending hours in the gym.