No nonsense "tough love" tone. Premise is to tense your muscles then release the tension, to help you relax into a stretch. I don't think I'll be able to get it right though without a professional pointing out what I'm doing wrong that could potentially be harmful to my ligaments or knees.
EDIT: I tried the stretch for the saddle split (after 15 to 30 minutes of warming up, of course), where you pretend you're kicking the walls apart with your feet, which tenses you. Then you breathe out and let your chest drop closer to the floor. I couldn't believe it but this was the farthest I've gotten in my stretch. I don't know if I was already capable of this before (the book says that you are), but by putting a bit of faith in his theory, I was able to stretch as I never have before. Will have to go over this book one more time.
For anyone interested in the videos he has his own YouTube channel:
Part 1: http://www.youtube.com/watch?v=yuU4E2LhHDw
Part 2: http://www.youtube.com/watch?v=RB02UYaQ0rE
Paer 3: http://www.youtube.com/watch?v=KaljiH52D4g