Art of Sitting

Correct working posture
Always sit back and move your chair close to the desk to maintain contact between your back and the seat back to help support and maintain the inward curve (A) of the lumbar spine. This can easily be achieved by choosing a seat which has a forward tilt of 5º-15º (B) - thereby ensuring your hips are slightly higher than your knees.
Poor working posture
Do not perch on the front edge of your seat. Do not place your keyboard too far away from you - move it closer to the front edge of your desk. Avoid incorrect slouching where the angle of the pelvis rotates backwards. This
results in the loss of the inward curve in the lumbar spine and cause excessive strain on the lumbar discs.