1, improving cardiovascular system

Swimming plays an important role in improving cardiovascular system. The stimulation of cold water can promote blood circulation through heat regulation and metabolism.

2. Improve lung capacity

Breathing mainly depends on the lungs, and the strength of lung function is determined by the strength of respiratory muscle function. Exercise is one of the effective means to improve and increase vital capacity.

3. Improve the function of respiratory system

One of the main characteristics of water is incompressibility. Because the density of water is more than 800 times higher than that of air, the pressure on people in water is far greater than that in air.

4, improve the ability of muscle system

Swimming is a whole-body exercise, which can mobilize more muscle groups to participate in metabolism and energy supply than other sports.

Features of swimming events:

A swimming style with great practical value in military affairs, production, survival skills and life service is called practical swimming. Such as crawl swimming (freestyle), breaststroke, side swimming, diving, treading water (standing swimming), water rescue, military swimming, backstroke, dog planing and so on. But there are also all kinds of synchronized swimming that challenge people's vital capacity.

Extended data:

Precautions for swimming:

1, physical examination

Because when swimming, people consume eight times as much physical strength as usual, so people with heart disease, active tuberculosis, liver disease and kidney disease should not take part in swimming. People with pink eye and infectious skin diseases should not swim to avoid mutual infection.

2, warm-up exercise

Do warm-up activities on the shore before launching, or suddenly do more intense activities, which may easily cause muscle injury or other accidents. Lift your legs, squat, and stand up.

3. Preventive measures

When diving, you must find out the water depth and underwater conditions to prevent accidents such as bumps and injuries, and at the same time avoid the abdomen and testicles being directly hit by water. Also protect the ear, because the ear is hit hard by water, which will make the eardrum sag inward and even rupture, leading to deafness.

If there is water in the nose, don't pinch your nose and blow hard, which will easily squeeze the water from the nasopharyngeal cavity into the middle ear through the eustachian tube, causing otitis media. After swimming, rinse the whole body with clean water again to avoid infectious diseases. Generally, swimming pools have showers.

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