When you focus on body movements, you consciously try to control your movements. And the result is that you constrain your motor system and use more energy than necessary. Now, when you use external focus, using more automatic control processes, which are unconscious, much faster. As a result, movements are more efficient, more fluid, smoother and more accurate.
Should you visualize success or failure? How do you bounce back from a mistake? And will Maria hustle Angela into a poker game?