Here is the meditation cushion mentioned in the Webinar. If you have not watched the webinar, no worries. We talk about Zazen Meditation as one of the enhancements to The Master Key System. It is easier and much more comfortable to sit for longer periods of time. See the instructions on the menu item below this one. This cushion will help all Zazen positions (not really needed for The Chair position though). As mentioned in the webinar, my preference is the Seiza position.
You can purchase it on Amazon here.