Fatty liver: It is a lesion caused by excessive accumulation of fat in the liver cells due to various reasons. The total amount of fat in the liver of a normal person is about 5% of the liver weight and contains phospholipids, triglycerides, fatty acids, cholesterol and cholesterol lipids. The amount of fat over 5% is mild fatty liver, over 10% is moderate fatty liver and over 25% is severe fatty liver. When the total fat amount in the liver exceeds 30%, it can be detected by ultrasound and diagnosed as “fatty liver” by ultrasound. In patients with fatty liver, the total lipid amount can reach 40%-50%, some reaching 60% or more, mainly triglycerides and fatty acids, while phospholipids, cholesterol and cholesterol lipids only increase in small amounts. Generally speaking, fatty liver is a reversible disease, and early diagnosis and timely treatment can often restore normalcy. According to the way the body metabolizes substances during exercise, exercise can be divided into two categories: aerobic exercise and anaerobic exercise. When the intensity of exercise is not large and the oxygen supply is sufficient, the breakdown of glycogen is mainly aerobic, and the metabolites are CO2 and H2O. When the intensity of exercise is large and the oxygen supply is relatively insufficient, the anaerobic metabolism is mainly, and the anaerobic metabolism causes the accumulation of lactic acid, so that the exercise of greater intensity cannot be sustained (such as short time and large intensity sprinting is anaerobic exercise). Therefore, the so-called aerobic exercise refers to the human body exercise when the oxygen supply of inhalation is sufficient, enough to exercise when the consumption required. The intensity of this exercise is equivalent to 50%-70% of the maximum oxygen intake (50%-70% VO2max) or exercise heart rate is equivalent to 70%-80% of the maximum heart rate (70%-80% HRmax). Aerobic exercise is a kind of exercise that lasts more than 5 minutes and still has spare capacity. This kind of exercise intensity stimulates various physiological function inertia to be overcome gradually, respiratory and circulatory system functions are improved, physical fitness and physical ability are enhanced, the dynamic balance between human body oxygen demand and oxygen intake is reached, lactic acid does not accumulate in the body, heart rate, cardiac output and pulmonary ventilation maintain a stable state, thus the duration of exercise is long and safe. It improves the aerobic exercise capacity by increasing the oxygen uptake and anaerobic threshold. The same quantitative exercise after the systemic exercise was seen to reduce the response of heart rate and blood pressure to exercise and reduce oxygen consumption, indicating that the energy metabolism was economized after the systemic exercise, and the result reduced the cardiovascular load during exercise and improved mobility. Exercise rehabilitation for fatty liver: Exercise programs for patients with non-alcoholic fatty liver should be based on low-intensity, prolonged aerobic exercise. Powerful activities characterized by aerobic metabolism are more effective for fatty liver patients to lower fat and promote fat loss in the liver. Therefore, according to their respective conditions to choose the appropriate exercise program: 1, walking diet: (1) ordinary walking method: with slow and medium speed walking, 30-60 minutes each time, 2-3 times a day. Suitable for leisure in scenic places. (2) Fast walking method (recommended!) : Walk 5-7 km per hour, 30-60 minutes per exercise. Heart rate should be controlled to less than 120 beats per minute. (3) Quantitative walking method: Includes walking on flat and sloping ground. For example, walk 100 meters on a 3-degree slope, gradually increase to 15 minutes on a 5-degree slope, and then 15 minutes on a flat surface. (4) arm walking method: walking two arms rhythmically swing forward and back, can enhance the shoulder belt thoracic activities, for people with respiratory diseases. (5) Mo abdominal walking method: while walking, while massaging the abdomen, which is also beneficial to people with indigestion and gastrointestinal diseases. 2, taijiquan weight loss: For patients of high age, it is relatively safe and easy to take this type of method. However, the time should be long and the intensity of tai chi is relatively small, so it needs to last a long time. 3, swimming: (1) swimming consumes a lot of energy. This is due to the resistance of the water when swimming is much greater than the resistance of the air when exercising on land, walking in the water are laborious, and then swim in the water, certainly consume more heat. At the same time, the thermal conductivity of water is greater than air 24 times, the water temperature is generally lower than the air temperature, which is also conducive to heat dissipation and heat consumption. Therefore, the energy consumed during swimming is much greater than that of land-based projects such as running, so the weight loss effect is more obvious. (2) can avoid lower limb and waist sports injuries. Weight loss exercise on land, because of the obese weight, so that the body (especially the lower limbs and waist) to bear a large gravitational load, so that the movement capacity is reduced, easy fatigue, so that the interest of weight loss exercise is greatly reduced, and can damage the joints and bones of the lower limbs. The swimming project in the water, obese people have a considerable part of the weight by the buoyancy of the water to bear, the lower limbs and waist will therefore be much easier, the risk of injury to joints and bones greatly reduced. Aerobic exercise: running, cycling, jumping rope, aerobics and other endurance exercise programs. Indications and contraindications of exercise therapy (a) Indications: Nowadays, exercise therapy is considered to be most suitable for fatty liver patients with insulin resistance and overweight. Therefore, all patients with obesity, type II diabetes, overnutritional fatty liver due to hyperlipidemia, and fatty liver after hepatitis can be treated with appropriate exercise under the guidance of a doctor. Among the treatments for these types of fatty liver, exercise is second only to diet control in importance. When diet control alone is used, the basal metabolic rate of the body decreases and energy expenditure decreases, while supplementing with physical exercise increases energy expenditure, and the combination of the two results in further negative energy balance. At the same time, it can also reduce the loss of body protein caused by simple low-calorie diet, forcing more fat decomposition, making beneficial changes in the composition of the body, enhancing physical fitness while losing weight, helping to reduce body weight, controlling blood sugar, lowering blood lipids and blood pressure, and promoting the regression of fat deposits in the liver. Some studies have shown that the lipid changes produced by increasing energy expenditure and restricting energy intake are more desirable than simply restricting energy intake, because the effect of exercise on fat metabolism is more targeted and mainly consumes body fat. (B) Contraindications: Although exercise can have a good effect on patients with over-nutritional fatty liver, not all patients with fatty liver are suitable to participate in sports. 1, overnutritional fatty liver with serious comorbidities: At present, the indications for exercise therapy for overnutritional fatty liver with comorbidities are still at the stage of accumulating experience, but if there are serious comorbidities in fatty liver patients, such as acute myocardial infarction, unstable angina, congestive heart failure, severe arrhythmia, severe hypertension, type I diabetes, renal insufficiency, significant impairment of liver function or the development of cirrhosis To cirrhosis decompensated stage, etc., should limit the activities to avoid deterioration of the disease, even if the exercise is permitted, the amount of exercise must be strictly controlled and closely observed in the process of exercise. 2.Fatty liver due to malnutrition, protein and other caloric deficiencies, hyperthyroidism and tuberculosis and other systemic wasting diseases (because exercise increases metabolism, too much exercise will aggravate the condition). 3.Patients with fatty liver caused by drugs, alcohol and toxic substances (too much exercise may become a factor that interferes with metabolism). 4, acute fatty liver in pregnancy, Reye’s syndrome, then activity should be limited, increasing the time of bed rest. In addition, exercise therapy is only applicable to primary obesity, while secondary obesity is not suitable for more exercise. Therefore, various examinations should be implemented before the exercise therapy starts and the respective standard weight should be set. Obese people with obesity degree of 70% or more can be given drug weight loss treatment first, and then start exercise therapy when their weight is reduced to less than 50% of obesity degree.