RE: the breathing excercises: I'm actually working to take the tension out from the diapraghm especially (along with the chest/shoulders/neck) in order to create a "pure" pressure of breath upon the lower tanden. This includes mental imagery (such as opening the upper tanden areas) along with sensitivity to the physical effects of breath within the body.
thanks for that. i was experiencing big changes by fully -relaxing- and flexing the entire are strongly...but quickly. Like once or twice each breath. Loose but intense flex; for just a split second. Developing 'quick twitch' reaction possibility then then helps to jjust let go and breathe uniform pressure later. brain trusts you... or something.