One of the reasons that a lot of younger players struggle with playing defense is simply that they have not been taught the correct way to play defense. You can't get better at something that you have never learned how to do, and also don't spend time working on. This defensive basketball drill is going to work on teaching the player how to close out on the wing, take away middle drive, and then finish the play.
It takes effort to play defense, but it also takes great technique. So really notice the coaching/teaching points in the video and do your best to master these movements. Along with learning how to be a better defender, this basketball drill is going to teach the players how to compete. If you are a coach and your team is struggling to bring energy to practice or training, do this drill. It will help to increase both the players energy and their willingness to compete.