Photo 6H, left, shows the arm placement a pro often uses when taking the racket back on the forehand. The elbow is up high, the arm is drawn back in exaggerated form, the body's coiling, the stance is open. But they, too, from this position, must adhere to the arm's leverage dynamics. If they don't, and a lot of them don't, their forehands aren't what they want them to be. The exaggerated use of the arm during a pro's swing is a symptom of inefficiency, much like low gas mileage for a large automobile engine.

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