This drill can be done with 2 or 4 students.
Singles: Have 1 student stand on the service line on one side of the
court and the other student stand on the other side of the court on the
other service line.
Have the student play a game only hitting the ball inside the service
boxes. Any ball to go deep or wide losses the point. If you want to play
with 4 students than play just like doubles, but only using the service
boxes as boundaries.
No volleys are allowed.
Good Luck on the Court!