Diaphragmatic control as taught in singing, in speaking, in yoga, is exercise.
It's good to lean something and then let it go, go back to home position, but this people won't do. As they start to learn anything, it gives them a new sense of being, and so they hang on to the new sensation. In so doing, they don't go back to the normal; they don't even go back to the old "home" position.
"Ida Rolf Talks About Rolfing and Physical Reality" edited and with an introduction by Rosemary Feitis"