When the day dawns and the cold is still fresh, there are many elderly people who love to exercise in the square and the park. But for the elderly with cardiovascular disease, this is not the best time to exercise. The cold weather in the early morning, easy to cause stimulation of blood vessels and nerves, so that sympathetic excitation, vasoconstriction, blood pressure, increased cardiac load, heart oxygen consumption increased significantly, and cardiac electrical activity becomes extremely unstable, easy to occur myocardial infarction, sudden death and other accidents. The Yellow Emperor’s Classic of Internal Medicine – Four Qi Tuning Shen Da Lun said: “In March, it is called the month of winter, this is closed, water ice and ground chap, no disturbance to the Yang, sleep early and get up late, must wait for daylight. This means that in the cold winter, we should pay attention to the protection of Yang energy, go to bed early and get up late, and wait for the sun to come out before starting activities. Therefore, the elderly with cardiovascular disease must not go out too early, you can do some appropriate activities at home. When the temperature is higher, go out and exercise again!