2. "Don't sit on the stone in winter" is because the stone has heat gathering and conductivity, and it is very cold in winter, which is a kind of yin evil and harmful to human body. Chinese medicine believes that keeping in good health in winter should focus on gathering yin and protecting yang. If you sit on a stone bench for a long time, the cold will invade the human body, which will lead to metabolic disorders, especially the kidneys.
3. "Don't sit on the wood in summer" is because of the high temperature and humidity in summer. Wooden chairs and stools placed in the open air for a long time contain more water because they are exposed to rain. Although the surface looks dry, it will emit moisture in the sun. Sitting on it for a long time will induce dermatosis, hemorrhoids, rheumatism and arthritis. Traditional Chinese medicine believes that dampness is yin evil, which is easy to hinder qi movement and damage Yang Qi. Damp pathogen is heavy and turbid downward, which is easy to damage the function of spleen and stomach and lead to indigestion.