Have your players take their stance on a piece of wood about the width of your shoe. Then set up a tee in front of them and have them hit away. This is a great drill to use for a player who has poor balance or tends to bail out of the batters box. You will be suprised at the number of players who will struggle to stay on the wood. Soon, however you will see dramatic improvement and will make better hitters out of every player in your lineup.