Calm the Mind and Hit on Time

Many well educated people have written their version of this principle.  Essentially, it is about verbally saying a word when you strike the ball.  The point of it is to give you a singularly focus when getting ready to hit the ball, to eliminate the 'chatter' in your brain.  In this video, the expert, Jeff, uses the word, "YES!" I've also come across,  "bounce, hit" and "split, bounce, hit." The later two examples incorporate saying something when the ball bounces-you figured that out, though :-).