Concentration on the baseline
by Anonymus
First, you start out standing in the middle of the base line.
Next, your coach feeds a ball to the base line, to one of the sides (backhand or forehand). If your coach can reach it, he hits it to the other side, or another hard shot.
You try to get it, and set up for another shot. It can be considered as a running drill.
It usually starts out slow, and the ball picks up speed, so you have to run faster.