Not actually how to fix a hernia! but more about how to ease the problem of working under a fixed layout.
With advancing age it becomes increasingly difficult to work under the layout. There are some alternatives such as tilting or fold-up layouts but they have disadvantages. I didn’t want a portable layout so my layout is screwed to the walls and supports. The layout height is 1020mm (3’4″) with a floor to head clearance of 840mm (2’9″) under the layout. Having the seat close to the floor was mandatory.
So I had to figure out a way to work with at least some comfort under the layout. I tried a very low stool on rollers but on my lino floor it was just too prone to sliding around (rocketing around might be a better explanation) and had no back support. The back support is what I need along with a stable base.