Track down Petri Raisanen wherever he may be teaching, and experience first hand the nature of “sidis” gained from years of energy healing, daily practice, and heartfelt teaching. He could be in Helsinki at one of the shalas he runs with Juha Javanainen (also a great teacher). He could be at a retreat in Goa, Thailand, or northern Sweden? He sat with Guruji and discussed the effects of every posture in primary and intermediate series in order to write his book. Wait for it in English, although the photos are amazing in any language.