The butterfly stroke is a stroke of swimming and the last of the four strokes.

The butterfly stroke is produced in a relatively short period of time, and it is also a very legendary stroke.

In the beginning, the butterfly and breaststroke were the same event.

In the early 30s of the 20th century, in order to improve the speed of breaststroke, some athletes raised their arms out of the water after the stroke, and swung their arms forward from the air, as if a butterfly spread its wings, so it was named butterfly stroke.

At the time, this new swimming style was often used in the same event as breaststroke, collectively known as the diving stroke. The two swimming strokes compete together.

It wasn't until 1956 that the Olympic Games separated the butterfly from the breaststroke, and the butterfly was officially held as a separate event.

Since then, in order to rapidly improve and improve the butterfly swimming technique, a provision has been added to the butterfly rules that can be used to hit the legs up and down in the vertical plane, which provides a basis for the butterfly variant dolphin swimming to participate in the official competition.

Dolphin swimming, on the other hand, is named after mimicking the swimming movements of dolphins.

Dolphins have a half-moon-shaped tail fin, and when swimming, they use their trunk and tail fin to make up and down waves to propel their bodies forward, and they swim very fast.

Dolphin swimming has been around for a long time, and in the 30s of the 20th century, American athletes used dolphin swimming techniques to create good results, but they were not included in the competition program due to the restrictions of the rules at that time.

After the rules were changed, it took only a few years for the dolphin swim to replace the original push-leg butterfly. In 1957, Hungarian athlete Tumpec set the first world record in the 100m butterfly using dolphin swimming.

In the history of competitive swimming, it can be said that there has never been such a smooth and rapid development as dolphin swimming.

The butterfly stroke is one of the fastest in competitive swimming, and its arm stroke power is also one of the largest in competitive swimming, and if its athletic performance improves rapidly, it may replace freestyle as the fastest swimming form in the world. But it has not yet surpassed freestyle because its propulsion is still uneven compared to freestyle.

Although the two arms can produce a lot of propulsion, the speed decreases rapidly when the arms are moved, and this uneven forward speed will inevitably consume more energy and affect the further improvement of sports performance.

Since the 50s, many countries have achieved outstanding butterfly results.

In the early 60s, Chinese athletes ranked sixth in the world in the 100m butterfly.

The technical development of the butterfly stroke has also gone through a very long process, and the Hungarian athlete Georg Donbeck first set the world record in the butterfly stroke, and his technical movement is three leg strokes in one cycle.

By the sixties, there were three types of butterfly strokes at that time: one was an arm-wide stroke, one leg hit, one leg drag; the second is a narrow stroke, the first leg is heavy, and the second leg is light; The third is the high elbow stroke, the arm stroke route is in the shape of a key hole, the second leg stroke is heavier, and the effective stroke route is long, and many elite athletes use this technique.

In the past ten years, the butterfly swimming technique has been one stroke with both arms at the same time and two strokes of the water.

In butterfly stroke, the body is prone in the water, and the body is propelled forward by the powerful strokes of the arms and the wavy strokes of the legs, so there is no fixed body position.

It is this technique that Sun Shiner is now practicing.

In the just-concluded Asian Games swimming competition, there are three butterfly events, namely 50 meters, 100 meters and 200 meters, of which the Chinese team won the gold medals in the 50-meter butterfly and 100-meter butterfly, and only won the bronze medal in the 200-meter butterfly.

Therefore, China's butterfly swimming level is still very high, Zhou Jiawei as one of China's current butterfly swimmers with the highest level, his strength should not be underestimated, and he has reached the World Championships 100m butterfly A standard, there is no problem in participating in this event.

Sun is currently considering competing in the 50m, 100m and 200m butterfly, and in the Asian Games, he reached the A standard of the World Championships in several events in freestyle, and entered the World Championships without any suspense.

Therefore, in this national swimming championships, Sun Shiner's goal is to achieve the World Championships A standard in the 50m, 100m and 200m butterfly.

However, Sun Shine still has great difficulties in this, because of the 100-meter butterfly and 200-meter butterfly, there are many people in China who have reached the A standard, and it can be said that the Chinese team has won the full quota of these two events in advance, so Sun Shine's goal is not only the A standard, but also better than other players.

"Hurry up." Yi Jing hung a timer around her neck and shouted at Sun Shiner in the water.

Sun Shine swam hard to the front, Sun Shine is not short of money now, this swimming pool is also made by Sun Shine himself, the purpose is to be able to train well.

"Whew!" Sun Shine came out of the water.

"Let's rest for a while." Yi Jing glanced at the timer in her hand and said to Sun Shinehui.

Sun Shine flipped over and went ashore, panting and asking, "How are the results?" ”

In recent days, Sun Shine has been training here, and although it is a cold winter, Sun Shine is still working very hard.

"The results are okay, the Asian record has long been broken, but the world record is still a bit behind." Yi Jing said very objectively.

Asian swimming is not very good in the world, so breaking the Asian record is really nothing.

"The 50-meter butterfly is still a test of explosiveness." Sun Shine said helplessly.

Yi Jing has been a guest coach recently, and she knows a lot about swimming events, "The 50m butterfly is not an Olympic event, what is the use of you practicing this?" ”

"You don't understand." Sun Shine shook his head.

"Why don't I understand? I just don't get it. Yi Jing asked suspiciously.

"The 50m butterfly is a World Championships event, so I have to do it." Sun Shine said decisively that although the 50-meter butterfly is not an Olympic event, it is a World Championships event, and Sun Shine is certainly unwilling to give up.

"Forget it, I can't control you, you better train hard." Yi Jing knew that no matter how much she talked to Sun Shine, it would be useless.

"I'm going to practice it too." Sun Shine turned his head and wanted to practice again, his skills were not good just now, and his results were definitely not good, this time he had to use his skills to see how the effect was.

"By the way, you won't compete in the freestyle competition in this championship, right?" Yi Jing asked suddenly.

"Not really." Sun Shiner shook his head, he reached the A standard in the freestyle events, and there was really no reason to continue to participate.

"Then you have to talk about it." Yi Jing reminded.

Sun Shine remembered that he hadn't told Chen Zhaoxue yet.

"I'll go after this trip." Sun Shine nodded.

After a brief rest, Sun Shine threw himself into practice again, and this time he used all his skills.

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