SSC418 Bounce and Hit Approach Shots
This practice drill provides a lot of advantages and progressive options.  It can work as a cardio drill and with large numbers. Two or four players start on the same baseline in two lines.  The other four players start in two lines on the opposite side about 2 yards inside the baseline.  Each player in that line has a tennis ball.  The players drop and hit an approach shot and follow it in to the net and play the point out.  Then they return to line after the point is over or they can move to the other side.  Both lines can play a point at the same time keeping the ball straight ahead and no lobbing.  Switch players after a certain time.

The pro can eventually feed to the approach shot lines once players are comfortable with the drill.