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no problem, I only have them at work because at home I need faster reactions, while at work it's okay.
As long as you keep appropriate sitting recommendations you could also add this for back support.
Also keep in mind that the wrist rest comes as a single wrist sleeve, so you need to order 2 for a pair. An alternative is recommended, but I just tried it and liked it
Have you tried something like this?
I have a spinal cord injury and throughout the first year and a half, some seats/surfaces caused incredible pain in my back. The support helped. I also had to bring my own cushion to sit on. Maybe just having a softer surface to sit on might help. So, maybe have a soft pillow/cushion to sit on might help with the pain.
Also, do you wear a belt when you sit? For me, a belt causes lower back pain after a while. Maybe take off or undo your belt when you're sitting. I have to undo mine to relieve some pain.
I don't see how the cement floor plays into it, but the ergonomics certainly can. If you can get a better chair do that, but also google back supports for chairs. They are pretty cheap and may be able to help with your seated posture.
edit: here is one example: https://www.amazon.com/Easy-Posture-Lumbar-Support-Black/dp/B00LGCWXCO
But there's a way around this right? Let's say I don't have access to another type of chair. I can just buy a back support like this https://www.amazon.com/Easy-Posture-Lumbar-Support-Black/dp/B00LGCWXCO and attach it to the chair's backrest.
If you find yourself having to sit in these chairs a lot, you might consider purchasing your own portable lumbar support like this one.
Additionally, if you don't feel like carrying around something like that and attaching it to every chair you sit on, you might consider a personal lumbar posture brace like this one.
They're laying in a back posture thing for your chair, like this one.