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So is that prana or oxygen?
Consciously guiding prana begins with a basic understanding of the energy body. Unlike the physical body, which is made up of flesh, blood, bones, cells, blood vessels, and vital organs, the energy body is made up of mind and energy: a system of spheres of light, sacred winds, channels of light, and chakras.
As with all things, you have to see that for yourself.
Consciously guiding prana
Drop all expectations, but to annihilate beliefs as a hindrance, is excessive and extreme.
I'm not talking about annihilating anything, just to recognise that beliefs are just beliefs, and that walking round with a head full of them often gets in the way of seeing things as they really are. And attachment to views can be a real hindrance.
Acupuncture studies have shown, for example, that in addition to the "placebo affect" (using dummy needles) which activated the part of the brain that produces natural opiates, when real acupuncture needles were used, that same area of the brain was activated along with a second area, the insular, which is associated with pain modification: http://news.bbc.co.uk/2/hi/health/4493011.stm
I guess one way of putting it would be that, if you accept the results simply as placebo effect, then at the least, the placebo effect of acupuncture convincingly outstrips both the placebo and non-placebo effects of conventional therapies in some situations (many of them quite newsworthy - cancer pain and nausea control, for example).
If prana/chi is more subtle than the coarse physical body and is connected with the mind/mental states, it would make perfect sense to think that mental states (like belief/attitude) affect the prana, and thus the outcome of healing sessions.