Generally speaking, sports are best arranged in the morning, followed by around 9 am and 5 pm. Middle-aged people usually exercise in the morning because of work. First of all, they don't conflict with work. Second, running in the morning has fresh air, which is good for the respiratory system. In addition, after sleep, people's physical strength is restored, but physiologically, people still have a certain degree of inhibition. Morning exercise is beneficial to nerve excitement, mental stimulation, metabolism promotion, and it is of great benefit to maintain abundant spirit and physical strength in a day's work.

Some people think that the oxygen content in the morning is low (plant breathing), and the fresh air is only less inhalable particles. At night, people's mental state is the best, so they should exercise around five or six in the evening.

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.