rules to play tee ball

When the umpire calls Batter Up, the batter shall take a set stance in the batting box. From the call Play Ball, the batter is not permitted to reposition the back foot such that, in the umpires opinion, the ball will be hit in an appreciably different direction. Front foot movement is permitted. The penalty for each back foot movement is Foul Ball and one strike is recorded on the batter.