With the development of swimming, swimming can be divided into practical swimming and competitive swimming. Practical swimming is divided into side swimming, diving, breaststroke, treading water, lifesaving and military swimming; Competitive swimming is divided into breaststroke, crawl, backstroke, butterfly and freestyle.
Swimming posture that imitates frog's swimming action. 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.
The early backstroke just floated on the water, and then it was propelled by the kick of breaststroke. At the Olympic Games in 1900, swimmers began to use the way of moving their hands forward on the water, and the way of kicking the ground did not appear until the Stockholm Olympic Games in 19 12.
1. You must swim under the guidance of your parents (guardians). Swimming alone is the most prone to problems. If your companion is not a parent (adult), it is difficult to guarantee that you can get proper help when you are in danger. (taboo for children)
People who are sick should not go swimming. Patients with chronic diseases such as otitis media, heart disease, dermatosis, liver and kidney diseases, hypertension, epilepsy and pinkeye, as well as those with colds, fever, mental fatigue and physical weakness, should not go swimming, because these patients are not only prone to aggravate their illness, but also prone to cramps, accidental coma and life-threatening. Patients with infectious diseases are easy to infect others. In addition, female students are not allowed to swim during menstruation.