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Backswing

(C)2006 Jeff Cooper licensed to About.com, Inc.
You certainly don't need anything more than the most compact backswing to hit a drop shot, but for disguise, it helps to use the same backswing as always. The main necessity is to have the racquet at least a foot above where you'll be meeting the ball so that you can brush down the back of the ball with your strings and thus create backspin. Backspin slows the ball's forward motion when it hits the court, making the second bounce, which is the best measure of the quality of your drop shot, shorter.