Nice video.
I took the performance freediving class out of Monterey last year. They are the real deal. Martin Stepanek and Kirk Krack were the instructors and I have to say I was not impressed until I took the class for myself. Had personal best in both static and depth on the second of a four day course. Highly recommended. and no I have no affiliation with them outside of being a student.
http://www.performancefreediving.com...ermediate.html