Combo moves are a great way to breakdown a defender in man to man defense, if used the right way. The reason that they work so well is because they use the defenders aggressiveness against themselves. The first move will get the defender to shift over to cut off the play, but that is exactly what the offensive player wants because they are going to use a second move to go back the other way.
This basketball drill is going to specifically work on the in and out between the legs move, but it is also going to help improve the players overall handles. It will help the player to get a lot of repetitions in a short period of time, which will help them master the move so that they can use in a live game situation.