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keyboard beside your monitor will make you turn your head while you type which could add tension to your neck muscles that may later result in neck strain.
Positioning your mouse
•The mouse should be placed on the same surface as your keyboard so that you can reach it with ease.
•Adjust its position to allow enough space for movement without making you stretch or lean over.
•Use your arm to move the mouse. Do not rest your wrist on the table when moving the mouse.