Five essential conditions that a chair should meet for each user:
1. Correct Seat Height: The feet should touch the ground, forming a 90-degree angle with the heels resting on the ground.
2. Correct Seat Depth: The knee joints should form a 90-degree angle, and there should be enough space for two fingers to comfortably fit.
3. Correct Armrest Height: We should be able to place our elbows on the chair's arms at a 90-degree angle.
4. Lumbar Support: It should never be absent, even during dynamic movements.
5. Correct Seat Area: The seat base and backrest height should conform to world-standard measurements.
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