To perform effective tennis drills for the backhand smash shot, it is important to have good posture and technique. The player should align well with the ball and shift the weight to the front foot to have a solid base for the shot. During the swing, the player should rotate the hips and shoulders to generate more power. It is also important to keep the arm extended and move the club head in a straight line to the ball.
Finally, the player should make sure that he hits the ball with the right height and force to achieve the desired effect. A good drill can be to practice the stroke slowly and then gradually increase the speed to develop a fluid motion.