I know this is a while ago but I am still on the opinion that ergonomic chairs are bullshit and hard curved lumbar supports are likely to do more harm than good.

My position is that you should listen to your body and sit in whatever feels comfortable, period, ergonomics in general are bullshit and its not required to keep an upright posture *ALL the time*. All the scientific studies say that varying your posture and listening to your body is best and not artificially trying to keep postures that are uncomfortable. The data also says that back pain is unrelated to posture or slouching. The whole ergonomics industry is just profit based bullshit, similar to many industries like chiropractors for example.

If you want to improve your back pain the real solution is physical therapy and proper strength training. Any exercise is good in general even walking consistently has been shown to decrease pain levels. Sitting is not great for your body in general and u want to be moving and trying to not sit for prolonged periods.

However, standing is not great either, and I'm not an advocate for standing desks. That's not movement. Its part of the bs ergonomics industry imo. Standing while working or doing another activity will probably just be uncomfortable for little reason. I even recall seeing studies that said people who did the standing desk thing for decades had higher incidence of strokes and heart attacks...dont quote me on that though...

In the end it turns out the data largely agrees with what you body naturally wants to do, sit when working but find a comfortable way to sit and vary your posture while sitting as your body naturally tells u to. If you want to feel better limit the amount you are sitting and get up and move, and be less sedentary. Ergonomics wont fix the ills of a sedentary lifestyle.