Mild-to-moderate coronary stenosis is generally defined as mild-to-moderate narrowing of the coronary arteries, which is amenable to proper running. Coronary artery stenosis is the narrowing of the coronary artery lumen due to various reasons such as coronary atherosclerosis. Its mild stenosis has a narrowing of <50%; moderate stenosis has a narrowing of ≥50% and ≤75%. Patients can carry out appropriate aerobic exercise, but be careful to avoid excessive exercise, not strenuous exercise, such as jogging, walking, cycling, climbing, tai chi and so on. If discomfort occurs during exercise, it should be stopped immediately and promptly go to the hospital for treatment. In addition, it is recommended that patients with mild to moderate coronary artery stenosis go to the hospital in time to avoid delays.