I have this book entitled "The Complete System of Self Healing Internal Exercises" By Dr. Stephen T. Chang. It's supposedly a system of Chi-Kung developed by the Yellow Emperor, it goes through all kinds of things - " Crane Breathing", "Deer Exercise", "North Star Meditation", "Immortal Breathing" etc. Ever heard of those? It warns about practicing slowly and gradually or you will experience a "disintegration into madness". With this in mind, do you guys think i should bother? Would it be safe?