Are you having a hard time getting to the ball, or hitting a lot of difficult shots? These problems are usually due to too much movement, not too little. Doubles players have been told to get to the net-- this is good advice-- but often they tend to be moving when the ball is hit. The term I have coined is to "Split- Spring" to achieve success. Get into a balanced position (split) before the ball is hit and then spring into action to attack the ball or court position as soon as you see the shot. Correct movement gets you to the ball with an easier shot, or it gets you in position to attack or defend your opponents shot.