Bud Herseth puts it this way. (From Tim Kent's notes). "When taking a breath, pronounce the word "ho" yet inhaling at the same time". "When using this method for practice, put hand on stomach and chest - it should move out on its own due to lungs filling up." "For getting a feeling of an absolutely open airway and flow, put one end of a(n) (empty) toilet paper roll in the mouth and inhale - note the equal easy inhaling and exhaling". Here is a link to Mendez showing complete mastery of breathing. I don't believe even Mendez could do a two minute long tone without circular breathing. YouTube - Rafael Mendez - Flight of the Bumble Bee & Mexican Hat Dance‏ Rich T.