There is no clear rule on how long you can exercise after vaccination. Generally speaking, after 30 minutes of observation, if there is no discomfort, you can do normal light exercise. In case of strenuous exercise, it is recommended to wait until 3 days later.1. Light exercise: After observing the vaccine for half an hour, if there is no adverse reaction, you can do some light exercise, such as walking, strolling, Tai Chi and other soothing exercises; 2. Strenuous exercise: Strenuous exercises such as running, basketball, tennis, soccer, etc. are not recommended within 1-2 days after vaccination. After strenuous exercise, the body’s blood flow is accelerated and a lot of sweating occurs, which can easily catch a cold and cause a cold. If you do not grasp the time and amount of exercise, your body is under tension, which may also cause dizziness, palpitations and other uncomfortable symptoms, because the vaccine itself can have similar adverse reactions, and the symptoms of the two may be confused, which is not conducive to observing the adverse reactions of the vaccine. Therefore, it is recommended to try not to exercise strenuously for 3 days after vaccination, reduce sweating, and pay attention to good skin care of the needle holes to avoid wound infection; eat a light diet, avoid drinking alcohol and smoking; and ensure that you sleep at night and do not stay up late to avoid adverse reactions. In addition, if adverse reactions to the vaccine such as fever, diarrhea, pain and other discomforts occur and are not relieved by rest, prompt emergency medical treatment is required.