Correct sitting posture: Sit in a chair and start looking for a good sitting posture by establishing the position of the lower body. Knee joint and hip joint should be at a right angle of 90 degrees. If your chair allows, you can adjust the height of the chair as needed until the joints are at right angles. Your feet should be flat on the floor. If your feet can't touch the ground, try using a footstool or putting a book under your feet.

The correct sitting posture in the office is to sit in two-thirds or half of the stool, with the neck standing on the top of the head, shoulders spread back, legs together, abdomen tucked between the hips, waist and thighs at 90 degrees, thighs and calves at 90 degrees, calves and feet at 90 degrees, and three at 90 degrees.