Maintaining any one body position over extended periods of time without change is onerous. Repetitive strain on your back, arms, wrists, and fingers can be caused by lack of whole body movement, unsuitable posture and repetitive overexertion in the workplace. Be conscious of your body positing, the setup of your workstation and the furniture and office equipment you select. Most importantly, take short breaks often throughout your work day. Brief but frequent interruptions to focused desk work will restore your ability to continue working efficiently. Taking a 5 minute break every half hour will help you to maintain both your productivity and your health.