To sit correctly, in addition to following the following techniques to place your legs, you should always keep your upper body straight, that is, your neck, chest and waist should be straight.
The examinee sits on the plane adjusted to the height of the fibula head, with his head positioned at the eye-ear plane, his eyes looking straight ahead, his left and right thighs roughly parallel, his knees bent at right angles, his feet flat on the ground and his hands lightly on his thighs.
correct sitting posture
1. For a computer chair with adjustable height and pulleys, it is best to choose a swivel chair with five rollers to ensure safety. The height and inclination of the chair backrest can be adjusted, and there is a cushion on the seat.
2. When sitting down, thighs and calves, upper arms and forearms intersect at right angles.
3. Sit back as far as possible, so that the spine can lean, thus reducing its load.
4. Don't be rigid in your sitting posture, and it's best to change it from time to time. Lean forward, sit up straight or lean back.
5. All feet step on the ground.
6. The distance between the eyes and the display screen should be 5-7cm.
7. The best position of the keyboard: when typing, the thenar of both hands (the root of thumb, the muscles protruding from the palm) is placed on the desktop.