What are the requirements for sitting posture in Pilu Jinnafo's seven-legged sitting method?

Piluzenafo's seven-legged sitting method: The so-called seven-legged sitting method refers to seven limbs. First, legs (commonly known as double plates). If you can't, you can use king kong sit (right foot on your left leg) or sit as you like (left foot on your right leg); Second, the hands are tied with samadhi prints (the right palm is placed on the palm of the left hand, and the two thumbs are opposite); Third, the back is upright like a string of copper coins (unhealthy people, let nature take its course first, and stay still for a long time); Fourth, shoulder level (not inclined to collapse and drag); Fifth, the head shrinks to the right palate (the back of the head shrinks, and the lower palate compresses the left and right arteries); Sixth, the tongue touches the palate (making the tongue lightly connected to the salivary gland center of the upper gum); Seventh, your eyes are half closed (that is, half open and half closed, you should open them easily when you open them, but you can't open them completely, and you should converge a little, but you should close them easily when you close them, but you can't fall asleep). Matters needing attention in practicing the seven sitting methods of Piluzenafo: When sitting, clothes and other things that bind the body should be relaxed together; When the climate is cold, the knees and the back neck will be wrapped very warmly; For beginners, the air light should not be too strong or too dark; Because the light intensity is easy to disperse, the light and shade are easy to faint. Three feet in front of the seat, there should be convection in the air; You can't sit when you are full and you can't sit when you are sleepy. It's good to sit down when you have enough sleep. Whether beginners or long-term learners, the hips must be slightly raised by two or three inches; When sitting down, rub your face and feet with your hands and do some moderate exercise; Sit with a smile. Relax facial nerves, be kind and tolerant; When learning to sit for the first time, sit less, sit as appropriate, sit more and use more frequently. When practicing meditation for the first time, practitioners should pay attention to their posture. Incorrect posture affects physiology and psychology and is easy to get sick. The seven sitting methods of Pilu Jinnafo must be stipulated in this way, which must contain profound meanings. It is the ancient people's summary of the natural laws of physiology and psychology, which should be studied and applied.