But after examination, the night is not suitable for exercise, for the following reasons:
After dark is not the best time to exercise, "Huang Di Nei Jing" said: "Therefore, the Yang Qi, a day and the main outside, Pingdan popularity is born in the middle of the day and the Yang Qi, the sun and the Yang Qi Long, day and the west and the Yang Qi has been weak, the gas door is closed. Therefore, the twilight and collect refusal, no disturbance of the muscles and bones, no see fog and dew, against this three times, the shape is trapped thin." Means that the human body's yang has the role of skin epidermal protection, the sun rises when the body's yang also began to activity, to the midday yang is the most abundant, sunset when the yang is weakened, the pores are also closed, so it is dark, the person should stop the activity to rest in order to conserve yang, defense against foreign evil; do not disturb the muscles and bones or contact with the fog. If you violate this law of movement, the body will be increasingly sleepy and weak.
The night harmful gases begin to accumulate, green plants can not photosynthesize will release a large amount of carbon dioxide, air quality is not good, especially early in the morning before the sun just came out, is the most serious pollution. Therefore, exercise time should be at least half an hour after the sun rises before going out to activities.