If you hit a one-handed backhand, you know that the high backhand is one of the most difficult shots in the game--so tough that even Roger Federer sometimes struggles with it. This drill develops shoulder strength and improves your technique. It's especially helpful for returning high-bouncing kick serves. Have a partner stand at the net and feed you high balls at the baseline. Take the balls out of the air and try to drive them deep into the court.

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Rafael Font de Mora is the founder of the iTUSA tennis academy in Scottsdale, Ariz., and the instruction website itusatennis.com. Font de Mora's program has produced top professionals and dozens of college players.