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I think that spin-based serves are essential if you want to stabilize your serve. One reason is that a ball with spin has a stable trajectory in the air, but the movement of the racket that puts spin on the ball also stabilizes near the impact point, so even if you swing hard, if you can touch the ball well, you can gain a lot of confidence in increasing the stability = repeatability. When professional golfer Fukui Retsu came to my school and taught at an event, he said, "Second serves are spinned, so it's important to swing harder! That way, the ball will have more spin and will definitely be a good serve." I think that's exactly right, and I practice it myself. For slice serves, imagine hitting the ball sharply across the court, and for spin serves, imagine hitting the ball with your head down and letting the trajectory expand upwards. Practice so that the trajectory can hit the ball firmly into the service area. The first video I made on YouTube was "Serve Study Group," and I started by saying that people who are good at serving are good at serving if they are confident that they can "hit it hard and it goes in properly." Being able to properly hit and control your second serve also means that you can control your opponent's return (to a certain extent). If you don't get discouraged with your second serve, you can aim more boldly with your first serve, and I think that the element that requires more strict control of your first serve starts with improving the quality of your second serve. Hitting it wide rather than center is less scary during the actual game. This video is designed to help you practice wide serves and slice serves on the deuce side, and spin serves on the advantage side, imagining the advantage of trajectory.