For a while now, I have been having my son practice his pitching at whatever the next level's distance is. For example, at 12U he pitches at 50 ft., 13U the distance is either 54 ft. or 60 ft. 6 in. depending on the field size, so when he does bullpens we do them at 54 ft.
Is there any advantage or disadvantage to doing this? He seems to like the idea of pitching "up" in practice. I think it gives him extra confidence in games. Just wondering what the experts think?