Who says people who love fitness and sports are not easy to catch a cold? This situation often occurs in people who do high-intensity exercise. After strenuous exercise, the human body will have a period of immunosuppression and be more susceptible to infection. Moderate intensity exercise will not have this problem. Epidemiological studies show that endurance training, especially long-distance running, is more likely to cause immunosuppression. And often go to the gym, people who don't know fitness knowledge have the mentality that Lao Zi is good at taking you flying and doesn't pay attention to hygiene. The gym is sealed indoors. . . A cold is normal.