Winter physical exercise, not only to strengthen the body and bones, but also to refine the will, if you can adhere to long-term must be very beneficial, but winter exercise should pay attention to the following points. First, winter exercise before you should do some simple limb exercise, which is beneficial to the safe and effective exercise body. The human body in winter due to the stimulation of cold air, often muscle, ligament elasticity and stretch significantly reduced, if the exercise is not done before the preparatory exercise, it is easy to cause muscle, ligament strains or sprains, resulting in exercise should not be carried out normally. Second, foggy days are not suitable for exercise, practice has shown that the fog is composed of countless tiny water beads, these fog beads contain a large amount of dust, pathogenic microorganisms and other harmful substances, exercise due to increased breathing, will inevitably inhale more harmful substances in the lungs, affecting the supply of oxygen, causing chest tightness, breathing difficulties and other uncomfortable symptoms. Severe cases can cause rhinitis, pneumonia, bronchitis, conjunctivitis and other disorders. In addition, foggy days, high humidity, the skin can be affected by the distribution of body heat, which is not conducive to exercise. Third, winter exercise should develop the habit of breathing with the nose, because there are many hairs in the nostrils, it can filter the air, so that the trachea and lungs from the dust, germs. In addition, the winter temperature is low, cold air into the nostrils can be heated, and then into the lungs will not produce stimulation, if the mouth breathing can make a lot of cold air directly into the lungs, resulting in strong stimulation, causing adverse consequences. Of course, the activity can be taken when the nose, mouth breathing together, but do not open the mouth too wide to prevent the cold air into the lungs and cause adverse consequences. Fourth, the winter season, the cold air on the lungs and bronchial tubes have adverse stimulating effects, can aggravate and induce bronchial inflammation and lung disease. Winter exercise pay attention to the cold to keep warm, the beginning of the exercise do not have to immediately take off the outer clothing, to be slightly warm body and then gradually reduce clothing. At the end of the exercise, you should wipe off the sweat on your body and immediately put on clothes to prevent a cold. Fifth, early morning blood sugar is low, the human blood stagnation, coupled with low temperatures, vasoconstriction and other factors, if fasting exercise may be due to hypoglycemia, especially the elderly, easy to die suddenly due to heart and brain diseases, so it is not suitable for morning fasting exercise.