This drill helps your first baseman work on covering first base and the footwork required to receive the throw.
Have first basemen in a line at their position.
Coach will stand midway between first and second.
First player in line will run to first and get in position to receive the catch. Coach will deliver a throw trying to alternate the location of the throw so players can work on footwork in all directions.
Once a player has caught the ball he will throw it back to the coach and go to the end of the line.
As players go through the line, coach should move to simulate throws coming from other positions.