1. The top of your monitor should be at eye level, and directly centered in front of you. It should be about an arm’s length in front of you. If the monitor is too high you may have neck and shoulder aches. You’re looking up at the monitor screen and not slightly down.
2. Your desk surface should be at roughly belly button level. When your arms are placed on the desk, your elbows should be at a ~90 degree angle, just below the desk surface. The armrests of your chair should be at nearly the same level as the desk surface to support your elbows. When you have your elbows supported by the armrests, you rest the shoulder muscles holding your arms.
3. Your feet should be flat on the floor with your knees at a ~90 degree angle.
4. When typing, your wrists should be in line with your forearms and not bent up, down, or to the side.