This is one variation of the "Wall Drill" that you can do on your own to improve your game during the season and in the off-season.
Wall Drills
This pdf explains the positions of lacrosse and gives some basic rules pertaining to those positions.
Positions
These tips for game play are broken down by position. They are split into three sections: Attack, Defense and Goalie. As always, Middies refer to both Attack and Defense tips.
Lax Tips