I emailed JC Stevens, the author of the book a few days ago to clarify many of the questions I have and he has not responded. If you have the book his Gmail address is in the very last page so you may want to email him. If enough people email him maybe he will get on here and clarify some things or respond. In Maha mudra, does anyone know if you inhale and exhale through the nose or mouth? I tried inhaling and exhaling through the nose and it's pretty hard when you're doing the exercise. But I've seen videos where people are inhaling and exhaling through the mouth. In the book he doesn't clarify. I did it through the nose because pretty much all the exercises up into this point he specifically says to inhale and exhale through the nose.