Great defensive teams finish the play with everyone doing their job on the boards. They make a conscious effort to box their man out and then pursue the ball. This rebounding drill is going to allow your team to learn to battle on the boards and get plenty of repetitions at making a great box out. It is also going to allow your players to compete and get after it, because as much as rebounding is technique, it is equally desire and the willingness to compete. Basketball drills like this quickly help you to realize which players are going to compete and those that are too cool to get dirty.