I compete against myself in competitions anyway, so I train against myself in practice.

I want to see where I measure up against everyone in the world and everyone who has ever competed in the sport, and there's that innate sense of wanting to challenge myself. I'm competitive in all aspects.

My biggest competitor? Myself, mentally.

I would say 90 percent of the stuff we do is technical anyway. If you look at a two-hour training day, 12 minutes are probably spent running or gaining fitness.

After asking questions about current recovery techniques, the conversation prompted me to ask myself, 'Why does it feel good after running to pour a bottle of water over your head?' I don't know the physiological answer, but the fact that it does feel better makes me perform better.

Track and field is tougher physically, but golf is tougher mentally.