The Safest Way to Sit

Head and Neck
Eyes should be about level with the top of the computer screen or the top third of the monitor. You
eyes drift down naturally when you need to glance at the bottom of the screen without straining your neck. It's also important to face the screen straight on. This can be a challenge for those who work with two monitors; always try to be aware of keeping your shoulders and hips in alignment.
Arms and Elbows

Lower Back
Many newer office chairs are designed with lower-back support built in, but if yours isn't, simply placing a pillow or support tool at the small of your back can help. The idea is to maintain the natural, reverse-C shaped curve in your lower back.
Legs
If your knees are higher than your hips, your chair is probably too low, while knees that are much lower than the hips mean your chair is probably too high. Ideally, your knees will be just slightly lower than your hips, allowing your thighs to be parallel to the ground and your lower legs perpendicular.
Feet
Both feet should be firmly planted on the ground so that that ankle joint can also be at 90 degrees. If you find your feet dangling off the floor, gravity may be pulling your back out of its natural curve. A foot rest, wedge or shoe box can help with this adjustment.
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