Firstly, I can clearly tell you that if you are sitting for a long time, buying an ergonomic chair is definitely useful from a health perspective and can indeed alleviate fatigue caused by prolonged sitting.

Ergonomic chairs can alleviate fatigue caused by prolonged sitting from multiple dimensions:

1. Headrest adjustment: Adjusting the height and angle of the headrest to fit the neck and guide the sitting posture to reduce human fatigue;

2. Lumbar pillow adjustment: The best support for the waist is the third and fourth vertebrae, reducing most of the weight pressure borne by the lumbar vertebrae;

3. Armrest adjustment: Arm support, relieve shoulder and neck pressure, and reduce human fatigue;

4. Seat cushion depth adjustment: For users of different body types, adjusting the seat cushion depth to an appropriate position can guide the correct sitting posture;

5. Seat height adjustment: Adjust the seat height for users of different heights to meet the needs of headrest and lumbar pillow adjustment, providing all-round support and relieving fatigue from prolonged sitting.