To improve footwork, both laterally and forward and backward. Two players start at the center of the baseline, one behind the other.
Player runs foreward, hits the approach shot, then moves back to the starting position.
Player moves laterally, hits the groundstroke, then moves back to the starting position. Player runs forward to hit the backhand approach, then moves back to the starting position. Player moves laterally, hits the groundstroke, then moves back to the starting position. This is a fast-feed drill. As soon as one player is on the move, the coach should feed a ball to the next player.