In fact, it is not the lack of exercise that makes you easy to get sick. First, most of the current colds are viral and easy to infect. Second, a normal person's resistance exists, and everyone is similar. If you exercise, your resistance will drop and rise, and it is easy to catch a cold when you fall. 3, it is recommended to exercise moderately, not excessively, and it is easy to catch a cold. 4, there is staying up late, and the resistance drops by 30% after staying up late.