Plan or react on returns?
Do you try to figure out where your opponent is going to serve?
Do you think ahead of time where you will return the ball if it is served to a specific location?
Do you plan the type of shot you will hit (Block, drive, slice, dip) before the ball is struck?
Do you decide to run around before the serve is hit?
Do you just concentrate, and react to whatever comes?
We stopped checking for monsters under our beds when we realized they were inside us.