Master Yang now has a one-hour guided meditation sequence I recommend. Preview:
https://youtu.be/B-qZkIZx1_cIt goes through the basics, to Embryonic Breathing, and then grand circulation.
Of course his Neigong video is a 5-hour in depth exploration of that with deep theory, history, qigong and conditioning exercises.
"Avoid Prejudice, Be Objective in Your Judgement, Be Scientific, Be Logical and Make Sense, Do Not Ignore Prior Experience." - Dr. Yang
http://www.ymaa.com/publishing