1. Adjust seat height
Set your chair high enough that your feet rest flat on the floor. Your knees should form roughly a 90-degree angle, or sit just slightly lower than your hips. This distributes your weight better and helps you avoid pressure on your thighs.
Set correctly? Your feet rest fully on the floor and your legs feel relaxed.
Tip: If your feet don't reach the floor properly, use a footrest rather than lowering your chair too much.
2. Check seat depth
Sit all the way back in your chair, with your back against the backrest. Ideally, there should be a few centimetres of space between the front edge of the seat and the back of your knees. This prevents pressure behind your knees and keeps your blood circulation free.
Set correctly? About a fist or three fingers should fit between the seat and the back of your knee.
3. Support your lower back
The backrest or lumbar support should support your lower back exactly where your spine naturally curves inward. This support helps you sit straighter and more comfortably, without having to force it.
Set correctly? You feel light support in your lower back, without any hard pressure.
4. Adjust your armrests
Let your shoulders relax and drop. Adjust your armrests so your elbows form roughly a 90-degree angle. Your forearms should rest lightly, without your shoulders lifting up.
Set correctly? Your shoulders stay low and relaxed while you type or use your mouse. Your armrests form a natural extension of your desk.
5. Let your chair move with you
A good office chair supports movement, not just sitting still. Adjust the backrest so you can easily lean back slightly, without feeling like you're sinking in or being held back.
Set correctly? Your chair moves smoothly with your body while still giving you enough support.
Dynamic sitting is much better than staying bolt upright all day.
6. Screen and keyboard
Finally, it's important to bring everything together. Your arms rest relaxed at desk height, your wrists stay straight, and your screen sits roughly at eye level. This stops you from leaning forward or straining your neck.
Set correctly? Your feet, arms, back and gaze all feel naturally aligned.
