To fight a bigger guy you need to train with bigger guys and it takes a lot more on your body. And it's not your weight class.
Georges St-PierreNick Diaz is a champion so he's got the spirit that comes with it. So he's not going to give up mentally. You see a lot of guys give up mentally and that's why they get knocked out or submitted. They give up mentally before they lose.
Georges St-Pierre