1. Line of sight
    Close your eyes and then open them slowly, you should look at the center of the monitor screen. If the position of the monitor is too high or too low, make the necessary adjustments to reduce the pressure on your neck.
  2. Elbow height
    When sitting comfortably, the closer the elbow is to the table, the better. This is to ensure that the upper arm is parallel to the spine. Place your hands on the surface of the desk (such as a laptop or keyboard) and adjust the seat height to ensure that your elbows are at right angles.
    At the same time, adjust the height of the armrests so that the upper arm is raised just slightly at the shoulder.
  3. Lower the height of your back
    When you feel tired, do not curl up in the chair. This will add extra pressure to your lower back and discs.
    Rest your hips on the back of the chair, and it is recommended to put a cushion so that your back can bend slightly. When you are tired, your body will not curl up and you can minimize the burden on your back.
  4. Thigh height
    Check whether your fingers can slide freely between your thighs and the front edge of the chair. If the space is too tight, you need to add an adjustable footrest to support your thighs. If there is a finger width between your thighs and the front edge of the chair, then you must raise the height of the chair.

Calf: lean your hip against the back of the chair, try to clench your fist and check if you can get your fist through the gap between your calf and the front edge of the chair