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The recommendations made based on your ROSA assessment come from the Canadian Standards Association guidelines on office ergonomics (CSA Z412). OHCOW has produced a detailed guideline for setting up your office workstation, and recognizing the risk factors associated with MSDs in the office. You can download that document here.
The set up of your office is key to improving your comfort while you work on the computer. However, even a "perfect posture" will lead to discomfort if it is held for a long enough period of time. It is recommended that you take stretch breaks, at least once an hour, to improve your comfort. OHCOW has produced a guideline for stretching in the office which you can find here.