This article includes a 1:24 video walkthrough.

Adjusting the upper back support is all about balance. After you've set the pelvis support, bring the upper back forward until you just start to feel it, then relax and "turn your muscles off." If the chair holds you in a balanced position, you're set. If you feel pushed forward, back it off. If you feel like you're reaching back for it, bring it forward.

Also called: upper backrest, upper back pad, shoulder support, Precision Posture System.

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Adjusting the upper back support is all about finding balance. So I'll show you on myself. I've adjusted my pelvis support already. It's in a good position for me. It's preventing me from tilting my pelvis back.

In this position, I'm going to bring the upper back towards me just until I start to feel it. So I'm starting to feel it now. I'm going to relax into it. And now, if I just turn everything off, turn off my muscles, do I feel balanced? That's the question to ask yourself. Do you feel like the chair is holding you in a balanced position when you turn your muscles off? In my case, I feel a little bit like I'm being pushed forward, so I'm going to do a little tweak. There.

Now, the thing to think about is you don't want to feel like you're being pushed forward, but you also don't want to feel like you're reaching for it. That would look like this. If it's too far back, I'm having to reach for it, and it creates an unnatural arch here that can cause some strain and discomfort.

So always make sure: listen to your body. Your body knows. It'll tell you. You want to feel that balance.