Everyone knows how to practice Tai Chi internal skills in a fixed position, but why should we face the south?

Because, the direction of the wind. In winter, a lot of cold wind blows from the north. The wind in summer mostly blows from the south or slightly south. In addition, the sun shines from the south. In the morning, from the side.

So facing south is not only good for light. And it’s good for health. Of course, if it's noon in the summer and you're practicing under the shade of a tree, just face wherever you feel comfortable. No one would practice boxing facing a garbage dump, facing the dazzling sunshine, or facing the biting cold wind.

To put it simply, it is health, to put it more complicated, it is environmental science. Superstitiously, it's Feng Shui.