Get down to the ball. Feel the extent of knee bend on the next ten shots. Take the racket back below the level of the ball to produce topspin. Notice the level of your racket in relation to the ball at impact. Feel the contact and notice the amount of topspin produced. Hit the ball in the center of the racket. Sense (not with your eyes) where the ball makes contact with the racket face. Plant your back foot when setting up for your ground stroke. Notice what percent of your weight is on your back foot as you prepare to hit your ground strokes