For the eyes, position and functional comfort to improve work or study efficiency 3. For the spine, to maintain a harmonious posture of the spine, to sit upright and to prevent hunchback 4. For the rib cage, maintaining uprightness and smooth breathing 5. For the legs, to improve swelling of the lower limbs caused by exercise 6. For the knee joint, knee support can greatly reduce muscle fatigue The benefits of so many improvements must be brought to our public attention.