Cardiac surgery patients without shock, cardiac insufficiency and severe arrhythmias are advised to get off the floor as soon as possible, e.g. 12-24 hours after getting out of bed and standing. The intensity of exercise during hospitalization should be low, with the heart rate after exercise being 10-20 beats/min more than the resting heart rate, and for the first few days, not exceeding the resting heart rate by 5-10 beats/min. Exercise should be intermittent, e.g., 2-6 minutes of exercise with 1-2 minutes of rest. The duration of exercise can be extended to achieve the appropriate amount of exercise. The intensity of exercise can be gradually increased after the condition is stabilized and the functional storage capacity is increased. If the exercise intensity is small, the exercise time is short, and the exercise volume is insufficient, the exercise frequency can be increased to meet the exercise volume. If the activity causes discomfort, pain, shortness of breath in the precordial area, or palpitations, an increase in heart rate of more than 30 beats/min, or >130 beats/min, or symptoms of cerebral ischemia such as dizziness and dizziness after the activity, or angina pectoris, dyspnea and other signs that the exercise is not tolerated, it means that the exercise intensity is too high, and the exercise intensity should be reduced or temporarily stopped. After exercise 6-8 minutes breathing, heart rate can not return to the pre-exercise state, or cause insomnia, prolonged fatigue, rapid weight gain (edema), should also reduce the intensity of the activity.