Also, this question just occured to me: From my understanding, Tibetan lung practices generally start at the crown chakra and proceed to the root chakra. Before I started doing Yantra Yoga, I'd been doing Tenzin Rinpoche's Tsa Lung practice for a few months, which proceeded this way. I also seem to remember reading something about the process of dying being opposite in Indian and Tibetan systems - ie, consciousness descending in Tibetan Buddhism. Because of this I was under the impression that Yantra Yoga worked oppositely, but I could be dead wrong, in which case I'd appreciate correction.