Remember that MH has frequently stated that if he were to describe each and every variation for the Sitz Bath, this would easily fill a 500 page book! This tells me that the Sitz Bath does not have a single purpose and therefore there is no one single way to do it. A 500 page book may well describe 500 different variations and or tweaks on how to do it, depending on what specific purpose one has. Part of MH's philosophy in obeying nature is consistent advice that serves the purpose of keeping waste moving "down and out" of the body......so, the particular Sitz Bath variation MH frequently describes is intended to promote the mud flowing down and out of the body.