First, why is there an old saying "Don't sit on a log in summer"?
As the saying goes, "Don't sit on a tree in summer, and don't sit on a stone in winter." Everything in the world will prosper for a long time and will prosper for a long time. When the weather was hottest, it was also the time when Yin Qi was born. So don't be too greedy, let your body.
"Don't sit on the wood in summer" is because of the high temperature and humidity in summer. Wood, especially wood, chair, stool, etc. When it is placed outdoors for a long time and exposed to rain, it contains more water. As soon as the sun comes out, the temperature rises, giving off damp heat. If you sit on it at this time, you will easily get skin diseases, rheumatism and arthritis. Therefore, there is a saying that "I don't sit on a tree in summer", which is also the secret of health preservation left by my ancestors.
Although the temperature is high and the weather is hot in summer, some outdoor wood has been experiencing wind and rain, and I don't know if it is dry. Most of the wood is wet. Although the surface looks very dry, if it is placed in the sun, there must still be a lot of water vapor in it, and the wood is often soaked in water vapor, which is easy to mold. If you sit on such wood, it is likely to cause skin diseases and hemorrhoids.
Second, why does the old saying "Don't sit on a stone in winter"
Don't sit on the wood in summer, because the humidity is heavy, and there is little rain in winter, so the humidity is not heavy. Why did our ancestors say not to sit on stones in winter? In fact, it is not because of the high humidity, but because of the more serious situation, that is, it is too cold. In winter, I wonder if you have ever touched a stone. Compared with wooden things, stones are often much colder. This is because stones get cold easily. Although it looks nothing, it may be very cold inside, so the older generation often says, don't sit on a stone to avoid the cold in winter.
What about sitting on a stone in winter? If you often sit on a hard stone in winter, although you don't feel anything, because of the temperature difference between the stone and the human body, it is easy to cause cold air to enter the body and have a negative impact on the balance in the body. Whether male or female, it will cause serious injuries and lead to many uncomfortable problems. So don't sit on a stone in winter, and don't bury health risks.