While you’re sitting there reading this, practice your net volley. Tell the truth now, did you twist your body to bring the racket back and then forward or did you just use your arm? I realized today (at the time I was twisting a large ball with my feet while resting on the ball in a pushup position) that I use my arm, not my body to hit the volley. Kind of silly considering that the racket does not have to come very far back for a volley and a short crisp forward stroke is all you need to hit a ball solidly when you are at the net. John McEnroe said he was so quick at the net because he used to stand very close to the wall and hit volleys off the wall. Go the the nearest backboard or the wall behind your local grocery store and practice hitting volleys against a wall by twisting your trunk instead of moving your arm by itself.