First, do not swim in the non swimming area

　　The waters of non swimming area in water complex, often reefs, mud and water, swirling, slightly careless, the accident could happen. Therefore, before launching, it is necessary to do a good job of investigation and research in the local area, so as to make sure that it is as far as possible from the weeds, reefs, cyclone and silt.

　　Two, do not drink before swimming

　　A large amount of glucose stored in the body after drinking can cause hypoglycemia. In addition, alcohol can inhibit the normal physiological function of the liver, impede the transformation of glucose in the body and reserve, resulting in accidents. At the same time, alcohol increases the chance of swimming accidents because it affects the brain's ability to judge.

　　Three, do not swim after strenuous exercise

　　After strenuous exercise, immediately swimming, will make the heart heavier burden; a sharp drop in body temperature, resistance will be weakened, causing colds, pharyngitis and so on.

　　Four, do not swim too long

　　Skin cold stimulation generally has three reaction period. Phase 1: after entering the water, the cold stimulation, skin vasoconstriction, pale complexion. Second stage: after a certain period of stay in the water, the surface blood flow is expanded, and the skin turns pale and pale red, and the skin is warmed by the cold. Third: stay too long, the temperature is greater than the heat hot hair, skin goose bumps and chills phenomenon. This is summer swims taboo period, should produce water in time. Swimming duration should not be more than 1.5 - 2 hours.

　　Five, hypertension, heart disease and other patients should avoid swimming

　　Intractable hypertension, drugs are difficult to control, swimming has the potential risk of stroke, should be absolutely avoided. Congenital heart disease, severe coronary heart disease, rheumatic valvular disease, serious arrhythmia and so on, should also keep a good distance from swimming".

　　In addition, there are otitis media, acute conjunctivitis, and some patients with skin diseases, swimming will aggravate the illness, resulting in bad reactions.

　　Six, do not neglect the hygiene after swimming

　　After swimming, should immediately wipe the body with soft dry towel scale, it is best to use fresh water rinse, drip chlorine or boric acid eye drops, blow out nasal secretions. If the ear water, you can use the same side jump, the water discharged. After that, do some relaxation exercises and body massage or take a 15 to 20 minute nap in the sun to avoid muscle rigidity and fatigue.