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Laptop users should use a docking station whenever possible. In the proper upright-sitting posture for computer use, the person's torso and neck are approximately vertical and in-line, the thighs are approximately horizontal, and the lower legs are vertical. For more information, visit the Occupational Safety and Health Administration's Good Working Positions page.
When standing, straighten up. Your body should be in a verticle position, no slouching. A user can elevate one foot on a rest while in this postion.