"I have three sons and I think anyone who is a parent can relate to that," Birk said. "Certainly it is a dangerous game and we're finding out more and more, every day, the long-term effects that this game can have. I think it's a joint effort with the commissioner, with coaches, with players, with everybody, everybody that wants to watch and make this game as safe as it can be. I think we're making strides in that. Football's a great game.