Or you could just sit on the ground which is what was originally taught,  the grounding wire was to be used if sitting on the earth was not possible. I have a mat that sits over top a pillow that I have woven out of thick copper wire, which is then connected to a grounding wire which then goes to a grounding rod outside.  I also sit outside in a tent with the bottom cut out when weather permits. No one I know of in our group at least sticks wires into their butt.