This is an excellent introductory talk to Holotropic Breathwork by Holly Harman and Marianne Murray from Holotropic UK. It covers all of the basic information regarding the practice of Holotropic Breathwork including some explanation of Stan Grof's cartography of the psyche. If you are interested in learning more about Holotropic Breathwork this is an excellent introduction.
Holotropic Breathwork: A non-drug methodology supporting preparation, experience and integration for work in expanded states of consciousness. Filmed as part of the non-drug states symposium at Breaking Convention 2015.