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How to prevent repetitive stress injury
Sit comfortably at your desk.
Correct posture and keyboard techniques can reduce the strain to your muscles. Properly position your body on the chair so you won't need to adapt your wrists and hands to the keyboard by bending them in awkward positions.
Place both feet flat on the floor and sit upright in your chair. Keep your knees at or close to the same level as your hips with leg muscles relaxed.