•Back — While sitting at your work surface, make sure your back is supported by the chair’s backrest in an erect position or angled slightly backwards.
•Arms — Your arms should be relaxed and loose, elbows close to your sides, with forearms and hands approximately parallel to the floor.
•Wrists — Your wrists should be as straight as possible while using the keyboard, mouse, or trackball. They should not be bent sideways, or more than 10 degrees up or down.
•Legs — Your thighs should be horizontal or angled slightly downward. Your lower legs should be near a right angle to your thighs. Your feet should rest flat on the floor. If necessary, use a footrest, but double check that you have your seat height adjusted correctly before getting a footrest.
•Head — Your head should be upright or tilted slightly forward. Avoid working with your head or trunk twisted.
•Overall — Change your position frequently and take regular breaks to avoid fatigue.
12 Getting Started