The time in doubles to improve your position on the court is when the ball is in the air. If your team is receiving the ball, you should be either moving to hit the shot or moving to attack or defend your partners worst shot. Once your partner has hit the ball, you are free to move again, depending on how much time you have before the ball is hit and where your opponents are. It is important to remember that it is impossible to move correctly if you turn to watch your partner hit the ball (i.e. don't watch your partner hit the ball!) The only way to be an effective doubles player is to maximize your time on the court, and that means always making the most of "air time."