One kind is people who are weak and sick. Due to the high altitude of Mount Tai, there is a big difference in temperature and wind between mountains, and the slope of the lower half of Mount Tai is large, so people in poor health are afraid that they can't bear such an environment.
The second kind is a boy, because it is said that there is a Taishan grandmother on Mount Tai. If a boy climbs Mount Tai, he may be left behind by his grandmother.
The third is the weak character. Mount Tai has been regarded as a natural place leading to the gods since ancient times. There are all kinds of gods on the mountain, but people with weak characters are easily influenced, which leads to poor health. So if these people climb Mount Tai, they should pay special attention and be careful.