The so-called six-character tactic is a favorite sport for middle-aged and elderly people. Specifically, it is: relaxing eyes and improving eyesight in spring, nourishing the heart in summer, and blowing lungs and kidneys in autumn and winter. In the four seasons, the spleen often turns to food, and the heat of the triple energizer is hard to stop. Comb your hair frequently, gather your breath, count your teeth and swallow your body fluid. If you want to repair Kunlun, you will always rub your hands. I don't know much about its main function, mainly: it is a breathing method. It affects the qi and blood movement of the immobile viscera and meridians through the different pronunciations of the words "Hui", "Ha", "Hu", "Chui" and "Xi". Besides, according to the old man, it can also delay aging. For the rest, you can read the encyclopedia or refer to China's health books.