Some one asked me some questions about the zhineng breathing exercise and I thought it would be beneficial for others to read about it and add comments if they have any.
[a] What does natural abdominal breathing mean? Are we are not to slightly pull in our abdomen all the time? What about pulling up huiyin and closing anus?
Natural abdominal breathing: When you breathe in your stomach rises and when you breathe out your stomach collapses back. If you are able to draw hui yin into lower dantian it will be good but if you cannot that is okay. It will come when you have advanced to a different level of awareness of the body, mind, and qi trinity. The same goes for drawing anus in.
[b] What does "withdraw forward the back" and strengthing the spine [during the start of ZBE] means?
"Withdraw forward the back" in pin yin "yao xiang chien ta" means you arch your lower back (the lumbar region) slightly towards your front so that your spine is ever so slightly curved forward. This is normal zhineng qigong posture requirement wherein the lower back is curved forward while sitting and curved backwards ("xiang hou du") when standing.
[C] What is the rhythm, type of breath and time in seconds for the inhale/exhale in ZBE1,ZBE2 and ZBE3?
No strict rhythm to follow. You do it at your own natural and comfortable pace. In zhineng qigong or any qigong practice it is never advisable to force your body for it will be counter productive and cause one to be unsettled - out of qi gong state if you like.
[d] Ideally what should one's mind be thinking/concentrating on during ZBE? What about YQ and THCMM. What did Jane's mention about visualization in advanced practice?
Prior to starting your mind or "yi" should be in the state wherein you are thinking ZBE will enhance the natural process qi exchange between yourself and the universe. As you breathe in your body opens up and receives hunyuan qi into every cell of your body. And as you breathe out you release qi back into the universe, thus occurs a natural process of qi exchange between man and nature in perfect harmony.
I did not join Jane's advanced practice but through some lectures i know that they did a lot more yang qi into the middle dantian.
e] Why is sitting on the floor to practice better than sitting on a chair? And how do one overcome the back pain?
I am not aware that sitting on the floor is better than on a chair. I should think getting the correct posture for proper relaxation is more important. If your back pain is due to soreness from practice it is okay as it is a sign of qi blockage clearing up and you will get better. I cannot tell you more unless you describe in more detail eg where is your pain located.
[f] Do we include building a qi field? If yes, is it internal hun yuan qi field?
Yes always set up a qi field. It is actually a practice to adjust our consciousness to a different level wherein our awareness of the surrounding or universe becomes more acute. I find it most beneficial to become aware of being inside qi and whatever I do I am doing it inside qi. At yet another consciousness level we become one with this qi medium and then we do not have qi "inside" or "outside"of ourselves. I do not recall Jane talking about whether it is internal hunyuan qi. I would not worry about this question as it would not matter in this case.
[g] What is the recommended duration of practice for beginers and advanced students for ZBE, THCMM and YQ
There is no recommended duration of practice. You just do for as long as you are comfortable. But do a lot of yang qi and you will progress better. I used to do two to three hours in one session.