I never thought about anything. I concentrated on defense and how to get through to the other fighter. It was a combination of reflex, muscle memory, instinct, and determination. I can't ever recall another thought entering my head during a fight or sparring. In the corner, I listened to my trainer and tried to process what I was doing right or wrong when I came out of my corner. I've heard other guys talk about a song going through their head, a fantasy, recalling a memory, a picture, or concentrating on something that made them angry....but I can't speak for them. I can't help but believe that if your mind is not focused on the fight, your setting yourself up for a loss.