Ron Kordes of Assumption High School says many players would rather reach with their arms to finish a pass rather than shuffle to the ball and get their body around the pass. He says that shuffling to center the ball in the body allows for greater accuracy and control.
A simple drill to practice the shuffle: Have two tossers about 10-15 feet apart. One passer opposite the tossers will shuffle back and forth between the tossers as they toss balls in front of themselves. Players can perform a certain number of repetitions or perform the drill for an amount of time.