[arresin]

That is simple but really smart.

One issue though is the lack of a back on the stool. You can make the case it’s a Good thing but when I really need to concentrate if I’m tensing muscles in my back to keep straight it won’t be the same—or you can slouch which also isn’t perfect.

[MattPalmer1086]

You should not need to tense muscles in your back to sit straight, or stand from that position.

I spent some time learning Alexander Technique - which is mostly all about your spine, sitting and standing. I can recommend it.