This drill helps to develop consistency in your cross-court forehand and backhand groundstroke shots. The drill does not require a partner, but it does require a wall to hit the ball against.
A typical tennis wall should have a line drawn across it to represent the net and should indicate the width of the singles court. Using chalk or just masking tape, make two targets on the wall. Each target should be 1 foot (30 centimeters) above the net line and 3 feet (90 centimeters) from the center of the wall. See the picture below.
1) Stand on the right side and aim for the target on the left side of the wall. Hit the ball with medium strength; do not try to hit winners on yourself. Wherever the ball comes back, aim for the target on the opposite side. For example, if the ball comes back on the left side of the court, then aim your next shot to the target on the right side of the wall. Your goal is to always hit cross-court shots. Establish a nice and smooth stroke to allow you to hit at least 5 to 10 cross-court shots in a row. Perform this drill for a few minutes.