This book describes several channels cleaning techniques by controlling the breath. It takes some basic knowledge to understand what is said, but we must not forget that these techniques are to be implemented only under the guidance of an experienced teacher (s). This is not because they are simple as they are ineffective. In addition, each practitioner is different, the master's oral comments will adapt practices case by case. What is good for one is not necessarily for another. Do not take this lightly, you risk ultimately have more obstacles, both rude (did that health) and subtle (which is misunderstood ... is misunderstood). if we add the fact that the translation has some gaps ...