I have taken a couple of classes from Roger Jahnke, a TaiChi and Qigong teacher, and he has a lot of good information on the web, both at his website (which you need to subscribe to) and on the Omega Institute website:

http://www.eomega.org/videos/roger-jahnke-3-minute-breathing-exercise-for-good-health

The Omega Institute site is an excellent resource and on this same page you will be able to listen to short talks by Pema Chodron, Panache Desai, Byron Katie, Jack Kornfield and many of the top thinkers in the field of complementary health/meditation.  Great way to get an introduction to many teachers and multiple techniques.  Hope you enjoy this site.

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