There is no such thing as “how long after exercise is the best”, because after exercise there may be a stress phenomenon that causes blood glucose to rise, the time to measure blood glucose is recommended to fasting blood glucose, blood glucose two hours after a meal as a criterion for judging; after exercise, if there is dizziness, fatigue, cold sweats, and other symptoms, it is necessary to measure blood glucose in a timely manner. Exercise may consume the body’s energy, resulting in a drop in blood glucose after exercise or after strenuous exercise may be caused by stress phenomena resulting in increased blood glucose, so there is no such thing as “how long is the best time to measure blood glucose after exercise”. Usually, the best time to measure blood glucose is to choose the fasting state, two hours after meals. Fasting blood glucose refers to the concentration of blood glucose measured when you have not eaten any food for at least 8~10 hours, generally refers to overnight fasting, the normal range is 3.9~6.1mmol/L. Two hours after meal is the concentration of blood glucose measured after two hours from the time of the first bite of food, the normal range should be less than 7.8mmol/L. In case of abnormal blood glucose values, it is recommended to go to the hospital and ask the doctor to make a judgment.