The butterfly stroke is different from other strokes, and its technical requirements are excellent. It is generally believed that the technical action of butterfly stroke is either very accurate or completely wrong. If you really want to master accurate technical movements, you must practice from bit by bit, and you must never neglect the training of basic skills. For example, when we observe the lateral technical movements, we must be aware of how the upper arm is parallel to the water surface at the beginning of the stroke. This is a common mistake made by many beginners of butterflies. They press their arms deeply and often ask a series of questions, such as "why can't we push the water forward with all our strength?"

Accurate and perfect butterfly stroke not only depends on the correct head movements, arm strokes and leg movements, but more importantly, the difference between butterfly stroke and other strokes is that the body needs to quickly change the range of different body shapes during the exercise. Breathing skills are very difficult for beginners of butterfly stroke. But once you master the accurate stroke rhythm, swimmers will easily use breathing techniques and relax their chest muscles scientifically. Butterfly practice should be correct.

As a special stroke training, butterfly stroke has great positive transformation value compared with the other three strokes. The stroke of butterfly stroke expands the application scope of lever principle, makes muscles develop and makes swimmers feel more about water. Once you master the perfect and natural stroke rhythm, butterfly will become a relaxed, beautiful and exciting water sport. Body flexion is the most suitable action for starting, so that swimmers can keep a good continuous stroke at the beginning. When the head and arms are watered, the head is lowered between the arms.

When the chest is pressed forward, the tarsus and the back of the thigh push the water upward together. Keep your body streamlined, keep a good momentum, and slide forward smoothly under the horizontal plane. All the above movements are the beginning of body flexion, which is a unique feature of butterfly stroke. Turn your arm moderately, keeping it almost straight and parallel to the horizontal plane. The arms are slightly wider than the shoulders, and the hands are everted about 45 degrees. After the first downward kick, the leg should stop for a while, let the body continue to "run", and the hand will press the water at the beginning of the next stroke.

At the beginning of the stroke, turn your hands sideways and keep your upper arms at a certain height from your shoulders to your elbows, parallel to the water. The posture of the upper arm is very important, because it can help swimmers develop their physical strength and effectively exert their strength different from brute force and paddling. When the arms are separated outward, the trunk presses the water while maintaining the forward strength of the body. At this time, the swimmer's head should be pressed down, his hands and forearms should be higher than his shoulders and head, and his chest should be pushed forward like a soldier's posture. The shoulders are underwater, and the hands and forearms complete the initial circular stroke.

Note: the upper arm is almost parallel to the water surface, and the downward pressure of the hand has been reduced to a minimum angle. Turn your hands and forearms back directly, and keep your elbows at a certain height, close to the water. The elbow has the largest bending angle (close to 90 degrees). When you finish the first stroke of the circle, keep your hands as close as possible to each other. When paddling, keep the elbow height and move back in line with your body. Keep your back straight and your head in line with your spine. The knee bends when the leg enters the water for the second time. After the stroke is completed, both hands accelerate and push back. Through the biomechanical strength of both arms and the joint efforts of the second kick, the head and shoulders are exposed to the water, the face of the exerciser faces straight ahead, and the water is lifted up under appreciation, which is convenient for swimmers to inhale.