I once sat with an athlete a few hours after the biggest competition of his career. For years, he had imagined how the day would unfold. He knew where his family would be sitting. He knew what he would say in post-match interviews. He had rehearsed the victory long before it arrived. Then he lost. Not dramatically. Not through bad luck or controversy. He simply wasn't good enough on the day. When he came into the room, he looked less disappointed than confused. "I don't know