It is not advisable to run before or after meals. Running after a meal or eating immediately after running will reduce the secretion of gastric acid, affect the digestion of food, and cause stomach problems over time. Generally, it is better to exercise after meals 1 hour. Running exercise before going to bed is not good, and exercise before going to bed will make the cerebral cortex in a state of high excitement, resulting in adverse reactions such as dreaminess or difficulty sleeping.

However, it is not suitable for doing large-scale exercise on an empty stomach in the morning. If the fitness distance is long, you can drink a small glass of sugar water or eat less snacks first.