Aloha Ananda,
The reverse breathing is the breathing method he teaches and recommends throughout the exercises and meditations. He introduces it (but not by name), at the beginning of the video and also in the manual in the Beginning of the Universe portion found on page 11.
There are many references to it on this Forum. Doing a quick search on breathing or reverse, will pull up plenty of references for you.
In regards to the blood pressure situation, after going through the "Beginning of the Universe" setup at the beginning of the work, say in you mind "All my channels are open, Blood pressure is up to normal!" Then continue into the work.
Much Love, Shawn
