1. Have a physical examination first. If you have hepatitis, nephritis, heart disease or tuberculosis, you should not exercise immediately. You should treat these diseases first. If no other complications are found, you can also do some self-tests, such as squatting 10-20 times in a row, or running in the same place 15 seconds to see if there is any discomfort such as shortness of breath and chest tightness. If not, you can start exercising.

2. Pay attention to the preparation activities. Obese people's cardiopulmonary function and joint flexibility are poor, so they can't adapt to a lot of exercise at once. Therefore, in the early stage of exercise, there is usually a preparatory training process of about 2 weeks. Before each exercise, you should also do 5 minutes of warm-up activities to avoid sprains of limbs, muscles, tendons and ligaments during exercise.

3. Old people are slow in reaction and exercise, and are not suitable for fast, intense and heavy-duty exercise, so as to avoid falling and accidents. Generally speaking, you shouldn't exercise alone. It's better for many people to practice together or to be accompanied by relatives and friends.

4. Children, because their physical development is not perfect, can't bear strenuous exercise for a long time, and are very prone to fatigue, so they should exercise moderately and have more rest during exercise.

5. Patients with stage Ⅲ hypertension should not take physical exercise. Patients with early and stage ⅱ hypertension should also choose simple and easy exercise, and prohibit excessive movement of the head and trunk to avoid a large amount of blood flowing to the head and accidents.

6. If patients with coronary heart disease have uncontrollable arrhythmia, frequent angina pectoris, early acute myocardial infarction and heart failure tendency, it is temporarily not suitable for physical exercise. People who are suitable for exercise should also choose moderate and low-intensity exercise and carry first-aid drugs such as nitroglycerin tablets with them.

7. Obese people exercise, just like normal people exercise under heavy load. The first thing to bear is the overload of knee and ankle joints. Therefore, damage to these joints should be avoided. Overweight people can't take part in running, climbing mountains, climbing stairs and other impactful sports. You can choose to swim, with the help of the buoyancy of water, reduce the heavy burden of obese body, so that it can swim in the water with ease.