It is best not to exercise outdoors in foggy mornings. Due to air pollution, fog contains many substances harmful to human body. When people do strenuous activities such as long-distance running in foggy days, some sensitive parts of the body will come into contact with these harmful substances and be inhaled in large quantities, which may easily cause tracheitis, laryngitis, conjunctivitis and allergic diseases. So on foggy mornings, we can do morning exercises indoors instead of going outdoors.
Health means that a person is in a good physical, mental and social state. Health includes two aspects: first, the main organs are disease-free, the body shape develops well and evenly, the physiological functions of various human systems are good, and there is strong physical activity and labor ability, which is the most basic requirement of health.
Second, it has strong disease resistance and can adapt to the effects of environmental changes, various physiological stimuli and pathogenic factors on the body. The traditional concept of health is "disease-free health", while the modern concept of health is overall health. The World Health Organization puts forward that "health is not only the absence of physical diseases, but also mental health, good social adaptation and morality".
Therefore, the health of modern people includes: physical health, mental health, mental health, social health, intellectual health, moral health, environmental health and so on. Health is a basic human right. Health is the first wealth in life.