Also, don't drop your shoulder at the end. I can't tell you how many girls I have who land the turn, then drop one arm down. You know that you're doing this if you always fall off the same side of the beam. Stretching tall throughout the turn should eliminate this, but so many gymnasts stretch tall until they think that they have finished the turn only to fall off (usually on their weak side, a lefty usually falls to the right of the beam). Keep stretched tight and tall until you have landed the turn, stepped out of it and are into your next skill.