It is best to exercise every day for about half an hour at a time. When there are really difficulties, the exercise should not be less than three times a week. At the same time, it is necessary to reasonably arrange the time, develop a good habit of exercising on time, pay attention to grasp the appropriate amount of exercise.
Morning exercise should be chosen after the sun comes out.
Elderly people often choose to go out to exercise in the morning, and most like to go to places with trees. But green plants after a night of respiration, around the trees will accumulate a lot of carbon dioxide, exercise in such an environment, is harmful to the human body. So the best time to exercise in the morning should be when the sun comes out and plants start photosynthesizing, consuming carbon dioxide to produce oxygen.