Forehand and backhand shots are the most basic and most important technique in tennis. A stable front and back shot is required by players of any level. The wrong application of wrist movements can easily damage the stability of the forehand and backhand. The human wrist is very flexible because it is naturally considered easy to control. In fact, if you want to use a weak wrist to control the ball, it is not only not effective, but also easy to get injured. (Schematic diagram of wrong wrist action) When watching the slow motion video of modern tennis, you can clearly see that when professional players swing to the hitting area, their wrists are in a back and fixed state, without any wrist turning movements, in order to increase the swing. The speed of the racket and the rotation of the ball will be pronation (forearm internal rotation). The wrist and forearm rotate as a whole, but the angle between the back of the palm and the forearm remains basically unchanged. This is the basic core of hitting stability. The same principle applies to interception techniques. The principle of this tennis wrist-fixing device is to fix the wrist, prompt the player to actively adjust the foot to find the hitting point, get the hitting power by pushing the ground and turning, and quickly form the muscle memory of the correct hit, and improve the hitting ability. Stability, increase the rotation of the ball!