Familiarity? Studied? Follower/Drinking the kool-aid?
I've just started looking into this and while there is science behind the results, I have yet to fully understand how his method allows someone to voluntarily influence the Autonomic Nervous System.
Lot's of YouTube videos of him, but mostly interviews and discussion on the results, not how the method gives you access to your internal controls. Looks like I need to buy something to find out more.