The only thing that works for me is a zafu, zabuton and the Burmese position. If you need a chair, I'd suggest sitting on the front edge of the seat, with the h

The only thing that works for me is a zafu, zabuton and the Burmese position. If you need a chair, I'd suggest sitting on the front edge of the seat, with the height raised so that your thighs are below the horizontal. A thin buckwheat cushion on a hard chair will probably provide the best stability.