The University of Edinburgh conducted a study on 20 17. 10 years later, it was found that regular swimming can reduce the risk of premature death by 28%. People who swim regularly have a lower risk of dying of stroke or heart disease by 4 1%. A 32-year follow-up study of more than 40,000 men by American scientists also shows that the mortality rate of men who have swimming habits is nearly half lower than that of men who do not exercise regularly. Gou Bo said that swimming can obviously improve heart and lung function and help to keep fit.
In addition, swimming can exercise the muscles of shoulders, waist, abdomen and legs, especially to enhance muscle strength and coordination. Because water is buoyant, it is not good for joints, especially for people with sports injuries or chronic diseases, and has a good rehabilitation training effect. According to a study in Applied Physiology, swimming can enhance bone density more than running. German scientists have found that swimming can not only strengthen the body, but also help prevent disc herniation.
As long as there is no drowning, swimming is less likely to get hurt than other sports. Beginners can generally master breaststroke, backstroke and freestyle to achieve fitness effects. Freestyle is more intense, and butterfly requires high waist and abdomen strength and coordination, which is the most technically difficult. Swimming is suitable for all ages. It is recommended to swim 2~3 times a week, and each swimming is about 1 hour. However, it should be noted that people with heart disease, severe hypertension, infectious diseases and ear diseases should not swim.
improvisational theatre
1. Any swimming style can be used in freestyle competition. But in individual medley and medley relay, freestyle refers to swimming methods other than butterfly, backstroke and breaststroke.
2. Every time you turn around and reach the finish line, a certain part of the athlete's body will touch the pool wall.
During the whole tour, a certain part of the athlete's body must be above the water. At the start and after each turn, athletes are allowed to be completely immersed, and their heads must be above the water before15m (including15m).