ve started sitting on my chair backwards, with the back
against my chest
and my legs straddling the seat. It seems to
help a bit (although it kind of hurts my boobs, but not as much as my back) and it won't last for long, again because of my belly, but if you have an armless chair like mine, maybe give that a try? I know some floor exercises that help my back too, but they're not helping as much anymore.