Office Chair Usage Instruction

The proper use of an office chair involves adjustments and sitting habits, with specific steps as follows:

1. Seat Height Adjustment
   The seat height should ensure that your feet are flat on the ground, with your thighs and lower legs forming a 95°-100° angle. Locate the control mechanism (such as a lever or knob) beneath or on the side of the seat and adjust it slowly to a comfortable height. If the chair is too high and your feet are dangling, use a footrest; if it is too low and puts pressure on your knees, readjust to the appropriate height.

2. Sitting Angle Adjustment
   Maintain a slightly reclined posture, with the backrest and torso forming a 100°-110° angle. This position effectively distributes lumbar pressure. The key is to ensure that your back (especially your lower back) is fully supported by the backrest, avoiding any gaps or excessive forward leaning. If the chair's recline angle is fixed, adjust your body's center of gravity to adapt.

3. Lumbar Support Precision Adjustment
   If the chair is equipped with lumbar support, position it at the natural curve of your lumbar spine (around the third to fourth lumbar vertebrae). The support should feel gentle yet stable, avoiding hard pressure or no support at all. For example, the Sihoo S300 features a multi-dimensional adjustable lumbar pillow, allowing users to fine-tune it to their body shape for optimal positioning.

4. Armrest Height Alignment
   The armrest height should be level with your elbows when they are naturally hanging down, allowing your forearms to rest comfortably on the armrests or desk, with your upper and lower arms forming an approximately 100° angle. This setup reduces shoulder and neck strain, preventing muscle fatigue caused by arm suspension.

5. Monitor Height Adaptation
   Elevate your monitor or use a stand so that your gaze is level with the top edge of the screen. This forces your spine to maintain a natural, upright position, reducing the need to lower your head or lean forward, thereby lowering cervical spine pressure.

6. Regular Movement and Functional Expansion
   Get up and move every 30 minutes, performing hip stretches, lower back releases, and other exercises to relieve muscle tension. Additionally, some chairs offer features such as seat depth adjustment (to accommodate different leg lengths), recline locking (for nap breaks), and caster mobility (for flexible office setups), which can be further optimized based on your needs.

Precautions: Adjustments should be based on your body's feedback, avoiding excessive pursuit of precise parameters; if the chair has limited functionality, supplement it with external lumbar supports or footrests. After long-term use, regularly check the tightness of screws to ensure safety.