To allow for proper alignment of your arms your keyboard should be approximately 1 inch to 2 inches above your thighs. Most times this requires a desk which is 25 inches to 29 inches in height (depending upon size of individual) or the use of an articulating keyboard tray. The area underneath the desk should always be clean to accommodate the user's legs and allow for stretching.
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Take frequent breaks to perform stretching exercises and relieve static loading from the shoulders (see Exercises).