With so many exercises, why is swimming called the best exercise?

As we all know, the advantages of swimming are that it can avoid joint injuries caused by exercise, effectively lower blood pressure, improve blood supply capacity of the heart, expand ventilation capacity of the lungs and improve the cardiovascular system. But it doesn't seem to be a sport that can be played anytime and anywhere, and it is not the mainstream in public cognition because of the high venue restrictions. If you look carefully, you will find that whether the swimming pool is full in summer or uncles swim in the river in groups in winter, the sport of swimming, whether in spring, summer, autumn and winter, indoors and outdoors, regardless of men, women and children, has already penetrated into people's daily lives.

Swimming is a good way to exercise anti-asthma ability. There are differences in body temperature, water temperature and air temperature. Regular swimming can improve the regulating function of the nervous system to body temperature and improve the adaptability of human body to cold and hot climate changes, especially to low temperature. In addition, because the density of water is hundreds of times higher than that of air, the chest pressure is very high when exercising in water, and it is even more necessary to overcome the water pressure when inhaling. This provides favorable conditions for human respiratory system movement, just like "weight-bearing exercise". However, swimmers with a history of asthma are advised not to swim during the onset to avoid danger.

Swimming is essentially a survival skill, or a hobby. Depends on what you think. If you just want to exercise yourself and master a skill, it will only become a skill, which will give you more chances to escape when the flood comes or when you play at the seaside. Similarly, if you especially like competitive sports, you can also take it as a career, improve your skills, and then win some awards to bring glory to yourself and your family.

Swimming is safe, but swimming breaststroke for a long time is not recommended. If you swim thousands of meters, it is best to swim freestyle, and breaststroke will slightly damage your knees. In addition, you should exercise your muscles seriously. After a long time, I will swim thinner and thinner. If you swim slowly all the year round, unless you arrange scientific training and do some land strength training and short-distance sprint properly, it will not help your muscles. So those who want to lose weight can swim for a long time. Swimming can't replace strength training.