Breaststroke: a swimming posture that imitates the swimming movements of frogs, and it is also the oldest swimming posture. In breaststroke, swimmers can easily observe whether there are obstacles ahead and avoid hitting them. /kloc-in the middle of the 0/8th century, breaststroke was called "breaststroke" in Europe.
Because the speed of breaststroke is relatively slow, in the freestyle competition at the beginning of the 20th century (free swimming without specified posture), the speed of breaststroke was not as fast as other postures, which made breaststroke technology excluded. Later, FINA stipulated the swimming stroke, and the breaststroke technique was developed. But breaststroke is most suitable for beginners to learn and for office workers to exercise to prevent cervical spondylosis!
Freestyle: This is one of the swimming events. Strictly speaking, freestyle is not a swimming posture, and there are almost no restrictions on its competition rules. Most swimmers choose to use this swimming posture in freestyle competition, which is the most labor-saving swimming posture with reasonable structure, small resistance, uniformity and high speed.
Backstroke: also known as backstroke, it is a swimming posture in which the human body lies on its back in the water. Backstroke includes backstroke and backstroke, because the face is on the water and breathing is convenient, but swimmers can't see where they are swimming and are prone to go in the wrong direction. Backstroke is the only position for athletes to start in the water, and others are jumping into the water.
Butterfly: It is one of the swimming events, and the butterfly technique evolved from the breaststroke technique. When the breaststroke technology developed to the second stage, that is, 1937- 1952, in swimming competitions, some athletes used the technology of paddling their arms to their thighs, then lifting them to the surface of the water and then migrating from the air. From the appearance, it dances like a butterfly with its wings spread out, so people call it "butterfly stroke".
Butterfly stroke is the latest stroke among the four competitive strokes. Because its leg movements resemble dolphins, it is also called "dolphin swimming"
Zhi Hu- swimming posture.