1, correct sitting posture. When reading and writing, you are required to sit upright, with your head straight, your shoulders flat, your body straight, your chest slightly erect, your shoulders drooping naturally, your thighs flat on the chair surface, your calves close together, and your feet flat on the ground.

2. The correct posture of reading. When reading, hold the book with both hands, the upper end of the book is slightly raised to form a 45-degree angle with the desktop, and the head leans forward slightly, which makes it easy to see the fonts clearly and can avoid the tension and fatigue of the neck muscles. It is not correct to put the book vertically or horizontally on the table.

3. The correct posture of writing. When writing, your head leans slightly forward than when reading. Both arms should be placed on the table at the same time, and the length should be equal. It is not allowed to put one arm on the table, or one arm on the table, which will bend the trunk and form deformity.

Extended data 1. Poor sitting posture will affect vision and the normal development of cervical spine.

2. Poor sitting posture can induce cervical spondylosis, leading to insufficient blood supply to the brain.

3. Bad sitting posture will lead to a series of adverse reactions, such as poor eyesight and memory loss.

4. Poor sitting posture can cause severe dizziness, numbness and even tingling in the back of the head.