Here’s a drill that provides players with opportunities to practice the correct motion, hitting a stationary shot and then a running shot. Players start in one line at the baseline. The first player goes through the forehand swing and then the pro tosses a ball and that player hits a forehand down the line. The player then starts to move across the baseline as the pro tosses another ball and the player hits a running forehand. The player finishes with another swing hitting an imaginary ball before going back in line.
Variations: Start on the backhand side, focus on different shots; slice, topspin, drive, lobs, etc.