It is much more difficult to break a habit when there is no adequate replacement for it. This difficulty often exists when we become moralistic about our tennis game. If a player reads in a book that it is wrong to roll his racket over, but is not offered a better way to keep the ball in the court, it will take a great deal of willpower to keep his racket flat when he’s worried about the ball flying out of the court. As soon as this player gets into a game, you can be sure that he will revert to the stroke that gave some sense of security that his ball would not sail out. It is not helpful to
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