In Europe it is quite popular a Swedish manufacturer (Stokke) that makes ergonomic chairs.
Many years ago I purchased the one in the attached picture.
The stool has three positions where the seat goes from quite low and horizontal to a more inclined poistion.
I wanted to have an opinion on this types of chairs; I am currently using it, it allows quite a good stacksitting with straight back, but I am not sure what is the most appropriate setting.
PS. Today I see the Stokke business has become now Varier.
Many thanks for the good job, keep going