And the breath helps loosen the tightness of the abdomen and the fearful, avoiding emotions that would hold it hostage by "protecting" it. And letting the abdominal fascia loosen up, freeing the emotions, deepening the breath, lets the ki move freely. And then the mind can be involved with the dantien and the ki. Then you can harmonize the bones, muscles and fascia with the ki, mind and kokoro.
After that, you can learn methods of really coordinating the body through dantien. So I hear.
don't have anything to say about emotional aspect, since i am a bit emotionally retarded.
i don't know enough about the dantien/hara movement to really describe, only that it's the focus and control mechanism of your internal power, and i don't meant it's in the sense of holding hand and singing kumbaya kind of sense. lately, i have a mind that we should have started the IS training here, dantien/hara movement, before other aspect of IS. but what do i know about these stuffs other than talking out of my ass.