"I like running in winter" and "Health is the capital of revolution" once said by a great revolutionary. I like sports, especially running in winter. I like running in winter. People who often insist on running in winter have improved body temperature regulation function, strong ability to keep out the cold, adapt to cold air quickly and are not easy to catch a cold. The frost resistance of limbs and exposed parts of skin is also strengthened with exercise to avoid frostbite. People who don't pay attention to exercise at ordinary times have poor cold resistance and can't adapt to climate change, so they are easy to catch a cold. In winter, human metabolism and blood circulation are relatively slow. In addition, doors and windows are generally closed, staying indoors for a long time, the air is dirty, and there is little contact with sunlight, which creates conditions for the invasion of various germs. Running outdoors often can get more sunshine. Ultraviolet rays in sunlight can not only sterilize, but also turn ergot in the body into vitamin D, thus promoting the development of bones and enhancing the functions of muscles and nervous system. Therefore, it is especially necessary to go outdoors and run in the sun in winter. I like running in winter, and it is very important to keep practicing long-distance running in winter. Those who take an active part in running at ordinary times should stick to it in winter. People who usually lack exercise may wish to start activities after winter, so that activities will be effective. Running may be a favorite sport for many fitness enthusiasts, and running in the morning in winter is a very exciting and fulfilling thing. I like running in winter, so I should pay special attention to warm up. It can make muscles soft and not easy to be injured, make joints more flexible, speed up blood flow, and prepare cardiopulmonary function and nervous system for exercise. Generally, you can simply move your waist, knee joint and ankle joint, and then walk or jog for 5 minutes (plus 527 punctuation words)