Morning running refers to a kind of physical exercise mainly based on morning running. Insisting on running in the morning can enhance physical fitness, improve immunity and improve mental state. Pay attention to jogging in the morning, and replenish enough water and a small amount of food before running in the morning. Foggy days are not suitable for morning running, and places with poor air quality are not suitable for morning running. The minimum amount of exercise to prevent diseases is at least 30 minutes a day. For people who can measure energy consumption, it is appropriate to consume 150 calories a day. However, activities without calorie consumption measurement are also good for your health. The best time to run in the morning depends on the season, usually when the sun just appears, and it is usually around 7 o'clock in winter. In the cold winter, many people choose morning exercises to enhance their immunity. However, outdoor fitness is not as early as possible. Relevant health experts suggest that outdoor fitness in winter should be carried out after sunrise. The ground temperature is low before sunrise in winter, and the content of pollutants such as carbon monoxide and carbon dioxide released in the air in the morning is high. In addition, harmful pollutants such as nitrogen oxides, hydrocarbons and lead in automobile exhaust also gather on the ground. If people get up early to exercise, they will inhale a lot of smoke and toxic gases. Long-term exercise in this environment may lead to fatigue, dizziness, pharyngitis and other diseases, which are harmful to the body. Fitness in winter should be around 10 hour. At this time, the sun shines on the ground after coming out, which makes the atmosphere begin to convection up and down, and the polluted air spreads to the sky, which will reduce the harm to the human body. In addition, the temperature is low in winter morning, and it will not slowly ease until half an hour after the sun comes out. It is best to exercise 3-5 times a week.