• Use an adjustable chair, keyboard tray, or desk/table to achieve the "neutral position" of a straight hand: wrist: forearm
• Keep upper and lower arms at a 90 degree angle to each other
• Position mouse as closely to keyboard as possible to minimize reaching and twisting

Consult these related links for more information on the elements of an Ideal Computer Workstation

• Viewing Angles and Distances
• Lower Back Support
• Legs and Feet