There are some clinical diseases that cannot be subjected to strenuous exercise, such as tumor diseases, respiratory diseases, endocrine system diseases, blood diseases, etc. If strenuous exercise is performed, it will aggravate the severity of the disease or affect the body functions. Take tumor diseases as an example, mainly including aneurysm and digestive tract tumor. Aneurysm is a kind of tumor with thin wall, if the pressure in the body increases after strenuous exercise, it may lead to rupture of aneurysm and serious bleeding. Patients with digestive tract tumors are unable to eat normally, which may lead to malnutrition in the long run, resulting in wasting and weakness. If patients perform strenuous exercise, on the one hand, their energy will be consumed a lot, and on the other hand, they may fall or strain because of their weakness, and in serious cases, they may also suffer from hypoglycemia. Therefore, the above-mentioned patients should not engage in strenuous exercise. If they need to exercise, they can do soothing exercises, such as walking, under the guidance of the attending physician.