1, the first method takes the right hand touching the wall as an example): When swimming close to the pool wall, the body stretches, and the right hand touches the wall with the palm in front of the left shoulder, and then quickly performs abdomen, knees and body movements. At the same time, the palm of the right hand pushes to the right, and the left hand paddles in the opposite direction in the water, so that the upper body rotates left around the front and rear axis at an acceleration of 180, and both hands extend forward from the water, and the two arms clamp the head, thus pushing the wall to slide.

2. The second method. When the right hand touches the wall, it rotates below the horizontal level, about 30cm below the water surface. When it touches the wall, it does the actions of raising its head, holding out its chest and abdomen. Then it raises the position of hips and legs by accelerating rotation, and then it does abdomen and hip flexion, supplemented by pressing the right palm to the right, so that the upper body rotates left around the front and rear axis. At this time, the legs are thrown into the pool wall through the air to complete the180 rotation, and then keep the supine posture.

3, arm technology. When the arm is paddling, the thumb guides the water flow. When moving the arm, the arm is perpendicular to the water surface and the upper arm is close to the ear. In the process of moving the arm, the arm rotates and the little finger is inserted into the water in front when entering the water. If the head position is 12, the water entry points of hands are 1 1 and 1 respectively. After the hand enters the water, paddle straight down. The arm stroke should be coordinated with the body rotation, and the position difference of the shoulder should be formed continuously. The stroke coordination between the two arms adopts the way of middle crossing, that is, the two arms are always in relative position, and when one arm strokes, the other arm moves.

4. Leg method. The leg movements of backstroke are composed of pressing down and kicking up, that is, straight leg pressing down and bending leg kicking. The downward pressure on the legs is accomplished by the contraction of the hip muscles. Because downward movement does not produce propulsion, the relative speed should not be too fast, and the leg joints should be naturally relaxed; Kicking action is completed by thigh driving calf and calf driving foot. Try not to expose knee joint or toe out of water under any circumstances. When kicking water upward, the toes should rotate inward to increase the water outlet area.