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Good way to exercise in winter: cold air bath is currently popular in Japan, the cold air bath is a good way to winter fitness. Cold bath is usually carried out in two ways: 1. Dedicated to the air bath: bodybuilders dressed in shorts, in the outdoors or in well-ventilated room to accept air bath, generally with the appropriate sports activities. 2. Daily life, working in the air bath: those who can use the gym, work or student school, after school on the road, relatively thin clothes to wear as much as possible to receive cold air bath. A lot of research results indicate that stimulation of cold air to the human body itself is a good fitness exercise. Use of air and skin temperature differences between the stimulation of regulatory activities to strengthen the body Wenzhong Shu, skin vasoconstriction, reducing blood flow and sweat secretion of the skin, improve muscle excitability and contractility; while the corresponding increase in the temperature of internal organs, blood circulation increase, can effectively improve their functional status. Therefore, the cold bath, feel good about themselves, work efficiency, increased colds and infections of the resistance. Of course, if improper methods of low temperature on the human body can cause local and systemic hypothermia, frostbite. Carried out in a cold environment, prolonged exercise (such as long-distance running, etc.), body temperature may be lost too much, then there will be dizziness, decreased coordination, gait instability, or even to lie down and other signs. For these reasons, the cold bath should pay attention to the following questions: