How do you keep proper posture while seated?

https://www.webmd.com/back-pain/news/20061129/back-pain-ease...

”Nov. 29, 2006 -- Lean back before reading this; your back may thank you.

A new study suggests that sitting upright for hours at a time -- for example, when working at a computer -- may lead to chronic back pain. Instead, the best position for your back is somewhat reclined, sitting at a 135-degree angle rather than the 90-degree angle most office chairs are designed for.“

I try to keep proper posture, but I don't think the correct chair for me exists. I need a headrest (doctor recommended) and some amount of recline. However, I cannot find an office chair that will actually recline properly. Yes, it is theoretically possible to recline, but perhaps due to my (lack of) weight, I cannot push these spring-loaded backs back without exerting some force beyond gravity, usually by pushing my feet into the ground. What I really need is something like a car seat, which has adjustable set recline. Does anyone know of an office chair like this?

Even if I solve that problem, it also seems that all office and car chairs are designed for people a little shorter than me, so everything is a few inches off.

There’s a pretty good chance your monitor is too low and your keyboard too high relative to one another. Make sure it’s comfortable to type and that you can look directly forward at your monitor while doing so rather than looking downward, which induces slouching and curling your shoulders, which in turn makes it more difficult to sit upright.

Make sure your desktop is at the right height for you to sit with leg joints at right angles rather than adjusting yourself or your chair to a desk that’s at some “standard” height.

The NHS guidance[1] on this has been helpful, but I think a key factor is being aware of your posture slouching, which is where taking breaks is vital so you can re-adjust.

[1] https://www.nhs.uk/live-well/healthy-body/how-to-sit-correct...

Search for office ergonomic setup. There are a lot of large and small things you can do, like get a split keyboard so your hands can be further apart.

There are hacks you can try, like buy a product designed to support your posture, or just get yourself in good posture and have someone put tape up and down your back, so that when you begin to slouch you'll feel the tape pull.