Keep the elbows in close to the body without rotating forearms inward or outward. The forearms should be approximately parallel to the floor. Remember, resting your arms against the edge of the desk cause unnecessary compression of tissue and blood circulation, and can cause damage to the ulnar nerve. The hands and wrists should extend naturally from the forearms. Slouching forward in your chair puts stress on the tendons and ligaments of the head, neck and lower back.
Back pain is one of the most frequently reported reasons for lost work time.
The angle between the trunk and thigh should be greater than 90 degrees, while the angle between the calf and thigh should be greater than 60 degrees. Keep both feet flat on the floor or on a footrest. The chair is the foundation for all other adjustments to your workstation. You should know how to adjust your chair so you can maintain proper posture as previously described. If you need help ask your supervisor.