In developing a system of magic that is focused specifically on the body, one of the challenges has always been how do you actually communicate with the medium you are working with. Since the human body is the medium, it's not enough to recognize you have a body, which anyone can do. To work with the medium of the body necessarily involves first being able to experience it on all the levels of the medium and second being able to communicate on all the levels. In Hands of Light, by Barbara Ann Brennan, she presents a technique where you can experience your body on a cellular level. You meditate and narrow your consciousness down to the level of a cell and then travel throughout the body as the cell, experiencing the different organs of the body as a result. The process works and its a useful way to experience the body.
The next level then is to actually communicate with the body. There are some Taoist breathing techniques that focus on helping a person remove negative emotional energy from organs. That's a step toward communication, but still not quite what we want.
My own approach toward this particular issue has involved syncing with the bio-photonic energy emitted by a cell and then using that sync to communicate with other cells. I'm not communicating with words, or even emotions. I'm communicating with impressions, specifically impressions that the cells are providing to me. It's not the same as verbal communication...it's much more subtle, and yet it can tell you a lot about your body. For example, what you might learn is not just where emotional tension is, but also if there are physical health issues (usually the two are linked). Consequently using these impressions can help you deal with health situations preemptively. The trick is to actually trust the impressions enough to get them checked on (via medical services), as well as developing processes (magical) that allow you to go in and begin healing yourself. The impressions you receive can also be used to help you do preventative health measures.
Seems to me that communication with the body is one of the frontiers that we still have, one that's mostly ignored because humans take it for granted that having a body is enough, and yet there are so many processes that for the most part remain unknown. To me, communicating with the body, with the cellsi n the body is the first step to exploring that frontier.