There are different types of ball handling drills that you can do to work on specific areas of your ball handling. For example, tennis ball drills are great for working on the players ability to handle the basketball with their eyes up, and to work on their hand eye coordination. This type of dribbling drill is great though, because it is not only going help the player develop their ball handling and hand quickness, but it is also going to work on a specific combo move that they can use during the course of a game.
The idea behind this move is to sell the defender that you are going to use an in and out move to get past them going one direction, but this is really only the set up move. Because as soon as the defender shifts over to cut off the in and out move, the ball handler is going to immediately go behind their back and drive past the defender going the opposite direction. This drill will allow the ball handler to get a lot of repetitions at this specific move, which will help them to be able to master it for game use, as well as improve their overall ball handling.