Aloha Cleo,
There are a lot of breathing techniques out there. Chunyi has included what he has seen and found the most benefit from in the manual, as well as the visualization to go with it under the "walking qigong section."
Since he doesn't have time to put every technique or nick-knack through a long-term test, he would also respond to a person asking such a question to work with it for a while and see what you find for yourself over a month or two of doing that type of two-puff, one long breath walking breathing.
Much Love, Shawn
