The wall explosions drills is about teaching the player how to start quickly and efficiently. In a game you may go from a complete stand still to having to sprint down the floor in transition. When this happens you don't want to have any wasted movement or motion. You want to be able to get into your full sprint as quickly as you can. This basketball workout is going to teach the proper technique to a quick start.
In this video you will see the instructor teaching how to do the movement, make sure that you really watch for the proper technique and look to repeat the motion. That way you will know that you are doing when you repeat the exercise during your own basketball training time. It is really important that you spend the time learning it the correct way before getting into the repetitions part of developing muscle memory. The instructor has worked with multiple professional athletes so you know that you will be getting expert advice.