Yeah, I don't disagree with the video. It is a good educational video! The only thing I'm pointing out, that I think wasn't covered in the video, is that if you let the wrist stay relaxed at the end of the motion, it might be a little bit dangerous. Obviously, I'm not a doctor, so I cannot factually confirm this, it's just what I feel like based on experience, but I know from the club I used to go to many years ago, the most popular wrist injury was because a person is relaxing the wrist almost completely during backhand topspin, which also requires this whip action. And I also remember that awful feeling myself, as I have injured the wrist during judo and then volleyball in the childhood. So, it's just a warning for people to not go too hard when trying this element, if you feel like you don't have pretty strong wrists.