Proper Posture for CEO's Office Chair

The correct sitting posture for a CEO's office chair can be summarized as 'three right angles,' with attention to detail adjustments and prolonged sitting management. Here are the specific points:

1. Core 'Three Right Angles' Principle

• Right Angle at the Knees: When bending the knees, maintain a 90-110 degree angle between the thighs and lower legs, avoiding excessive bending or straightening. Leave about a fist's width (approximately 5-10 cm) between the back of the knees and the front edge of the seat to ensure the thighs are parallel to the ground, preventing leg suspension or compression of blood vessels and nerves.
• Right Angle Between Thighs and Back: Keep the waist pressed against the backrest, maintaining the natural curvature of the spine and avoiding leaning forward or backward. The backrest should provide lumbar support; if the chair lacks a lumbar support, use a cushion to fill the gap between the waist and the backrest, reducing lumbar pressure.
• Right Angle at the Elbows: If there are armrests, naturally bend the forearms at 90 degrees and place them on the armrests to relax the shoulders; if there are no armrests, lay the arms flat on the desk, keeping the shoulders naturally relaxed and avoiding shrugging or arm suspension.

2. Detail Adjustments and Support Optimization

• Foot Support: Keep both feet flat on the ground; if height is insufficient and the feet are suspended, use a footrest or a low stool for support to prevent impaired leg circulation.
• Head and Neck: Keep the head upright, avoiding prolonged lowering or tilting back; the screen height should align with the line of sight to reduce cervical spine pressure.
• Dynamic Adjustments: Sitting posture does not need to be absolutely fixed; occasionally change positions (such as slightly leaning back or sideways), but maintain the overall 'right angle' framework to avoid prolonged maintenance of a single posture.

3. Prolonged Sitting Management and Health Recommendations

• Regular Breaks: Stand and move for 5-10 minutes every hour of sitting, performing simple stretches (such as neck rotation, waist arching, leg stretching) to promote blood circulation and relieve muscle fatigue.
• Chair Selection: Prioritize office chairs with adjustable height, backrest angle, and armrest height to accommodate different body types and enhance sitting stability.
• Environmental Coordination: The desk height should align with the elbows, avoiding excessive raising or lowering of the arms; the keyboard and mouse should be positioned close to the body to reduce shoulder protrusion.

Scientific Basis: Prolonged maintenance of incorrect sitting postures (such as hunching or crossing legs) can lead to issues like lumbar disc herniation, cervical strain, and muscle stiffness. By adhering to the 'three right angles' principle, body pressure can be effectively dispersed, maintaining the neutral position of the spine and reducing the risk of occupational diseases. Combining regular breaks with chair adjustments can further enhance the health benefits of sitting posture.