Years ago I took some classes with Harriet Hargrave. In one of the classes the entire first part of the class was on ergonomic sewing/quilting. I tried the [expensive] chair she used but found it didn't fit my body even with the adjustments [whew!] However, at the store I saw what their secretaries and workers used and asked to take one home over the weekend and see if I liked it. On Monday I ordered one for myself and love it. It almmost forces me to sit straight and I don't tire so easily. It is a Swopper. It can be ordered online or at a office furniture store. It has been worth the price.