1, freestyle: usually swimming in the crawl position, which is a swimming position in which the arms alternate and the legs alternate for six strokes. Crawling is a swimming posture with reasonable structure, small resistance, uniform speed, fast speed, the least effort and the fastest speed, so it is often used in competitions.

Freestyle is practical and plays an important role in the Olympic swimming competition. There are seven events in men's freestyle in the Olympic Games: 50m,100m, 200m, 400m,1500m, 4x100m relay and 4x200m relay. Women have six relays: 50m,100m, 200m, 400m, 800m and 4x100m.

Freestyle events account for 13 of all swimming events, and medley and medley relay also include freestyle, so freestyle is often regarded as a symbol to measure a country's swimming level.

2. Breaststroke: It is a swimming posture that imitates frog swimming. The human body is prone on the water, with its arms flexed under the symmetrical straight arms on its chest, and its legs flexed and stretched symmetrically to catch water, just like a frog swimming. In breaststroke, swimmers can easily observe whether there are obstacles ahead and avoid hitting them. Breaststroke is labor-saving, durable and of great practical value.

3. Butterfly stroke: Butterfly stroke technology evolved from breaststroke technology. In butterfly swimming, the body is prone in the water, and the body is pushed forward by the powerful stroke of the arm and the wave stroke of the leg.

4, backstroke: also known as backstroke, is a swimming posture in which the human body lies on its back in the water. During swimming, the head comes out of the water and it is convenient to breathe; Lying on the water is more labor-saving.