Swimming can improve people's respiratory system function. People who often take part in swimming exercises can have a lung capacity of 5000 ml, while the average person's lung capacity is only 3500 ml. After exercise, the lungs can fully inhale oxygen and exhale carbon dioxide, so that the metabolism of tissues and cells in the body is vigorous, which has a good effect on preventing and treating chronic bronchitis and improving emphysema. Secondly, swimming can improve the function of cardiovascular system, greatly enhance the function of the heart, and reduce the deposition of metabolic waste on the blood vessel wall. Also, swimming can increase the excitability of cerebral cortex, enhance command function and eliminate fatigue. Regular swimming can make fat metabolism better and avoid fat accumulation in omentum and subcutaneous tissue to form obesity.
However, swimming is not a sport that anyone can participate in. People with serious medical diseases, menstruating women and people with certain skin diseases and other infectious diseases are generally not allowed to take part in swimming. In addition, people with chronic suppurative otitis media, some deaf people have inner ear diseases and can't swim.
In addition, swimming should be done after meals 1 hour, because the stomach is under the pressure of water when full, which is easy to cause pain and vomiting; Be fully prepared before swimming to avoid cramps and colds; When you enter the water, don't jump into it suddenly. Before swimming in deep water, wash your face, upper limbs and rub your chest and abdomen in shallow water. After swimming, if the ears get water, you can use the side head jump method; After swimming, you must also thoroughly clean your body with clear water to wash off unclean water; In order to prevent eye diseases, it is best to drop some eye drops.