Strenuous exercise after vaccination may induce or aggravate adverse reactions after vaccination, so to avoid such cases, doctors will advise against strenuous exercise for 2-3 days after vaccination. However, if strenuous exercise has been performed, there is no need to worry too much if no uncomfortable symptoms appear. First, due to individual differences after vaccination, some people may experience fever, fatigue and other uncomfortable symptoms, in which case strenuous exercise may aggravate the uncomfortable symptoms. Secondly, strenuous exercise often leads to a lot of sweating, which makes it easy to get cold and cause viruses and bacteria to attack the body and cause infection. It is generally recommended to keep the injection site clean and dry for 24 hours after vaccination. Heavy sweating also tends to contaminate the injection site with sweat, which may cause local redness, swelling and pain and increase the risk of local infection. In addition, if you are not a professional, strenuous exercise is likely to cause discomfort, and if you have chronic diseases of the cardiovascular system, there is a risk of acute attack, so avoid strenuous exercise after vaccination. Appropriate exercise has a great positive effect on the health of the body and can strengthen the body’s resistance. If you want to exercise after vaccination, it is not necessary to be too strenuous, but you can reasonably do aerobic exercises such as walking and jogging. In addition to avoiding strenuous exercise after vaccination, you should also avoid drinking alcohol and avoid contact with or eating foods that cause allergic reactions.