"I've got a couple of things over [ Wladimir Klitschko]: He wouldn't spar with me when I went to the camp and I beat him in a mental toughness competition in the sauna."

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I go to practice each and every day, but my intensity is not the same. If I get tired, I'll go sit down. If I want some water, I'll go drink it. When I'm in training camp, I don't. I've got to push through being tired. I've got to push through being uncomfortable. That's really it. It's largely a mentality. You kind of flip that switch and turn your intensity up. Your heart rate goes up. Your reps go up. And you start to get in the frame of mind.

— Chael Sonnen