First, people's immunity can be improved through good exercise. It is recommended to do aerobic exercise for more than 30-45 minutes every day. It is suggested that outdoor sports such as running, brisk walking, mountaineering and hiking are all good exercises to increase immunity under the condition of full sunlight.

Second, adjust the diet to achieve a balanced nutrition and a reasonable diet, minimize the fat diet, try to achieve a low-calorie diet, appropriately supplement fruits and fresh vegetables, mainly vegetables with high chlorophyll content, try to eat less flour and rice, and the staple food is mainly coarse grains.

Third, it is recommended to drink more than 2500ml of water every day, preferably around 3000ml. By drinking more water and diuresis, it can promote the balance between internal and external environment, improve basal metabolic rate and enhance immunity.

Fourth, you can also take immune enhancers, such as protein powder, Cordyceps capsules, thymopentin, etc., which can increase immunity.