Player A is behind the service line; he has a tennis ball ready to feed, to begin the point. Player B is on the opposite side and inside the baseline.
Drill:
Each point begins with player A who feeds a ball short inside the opposite service court then moves up to the net to play the point. Right as the short ball is fed by A, player B runs up to it and the two play the point out.
So the rally finds both players up at the net: one following behind a short ball and the other chasing and returning it.
Depending on how short and low the ball bounces, player B must take a quick decision of what kind of shot he would play as soon as he gets to the ball.
The two players play the point out then move back to their initial positions and repeat the drill until one of them wins 5 points; then they switch sides and roles.
Note:
This drill is a singles tactic that teaches the players to make quick decisions and learn the best options that they should apply when dealing with a short ball.