If you've watched Bjorn Borg play tennis, you know that he wastes no energy. He organizes his consciousness in a very narrow band. It doesn't matter whether the crowd is going crazy cheering or booing; he doesn't hear any of that. There is no difference in his response whether he misses or makes an easy shot. He simply turns around and re-anchors himself—he twirls the handle of his racket as he walks back to begin the next play. He wastes no energy at all; he's entirely concentrated on essentials.