When writing, you should sit in a chair and keep a certain distance from the table. The head and neck are upright and natural, the head leans forward slightly, the shoulders are relaxed, the shoulders are not shrugged, and the back is not arched. Feet stable, flat on the ground, shoulder width. The stability of feet and body is related to the stability of words. Hold the pen in your right hand and lay your left hand flat on the table naturally. The left hand should not be the support point of the center of gravity. Open your hands, as if holding a big ball. In short, be dignified and straight, and stretch your joints; Spiritual convergence and smooth breathing; The right hand is light and agile, and the body is steady and natural.
Only when you are upright and solid can you be stable and easily exert your strength. The so-called "strength lies in the waist and roots in the feet"; Loose shoulders can reach elbows, wrists, fingers and pens, and they can be unconstrained and flexible.
Tables and chairs also have a certain influence on writing posture. The height and size should be appropriate, and sitting up feels natural, comfortable and not awkward.
As for the height of the desktop, it is better to adjust it according to personal height and other factors.