RE: Yogi Coudoux
It's through his breathing techniques that he used in his Pranayama exercises. I know that it takes a while for him to go into a state where his heart rate slows down dramatically. Sorry for being unclear.
BTW, thank you for the compliment. I first saw this person on That's Incredible many years ago. The only thing that realy bothers me is that I still could not find his real name.