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I've been doing the Vol 2 and 3 exercises on my back every now and then. Obviously if someone jumps in and says "hello no you'll hurt yourself" then I'll stop. What I find doing this is:
1. It really helps get rid of the tension. You can really let go of any tension in your entire body, something that Ken is always asking us to shake out and get rid of.
2. It makes me a lot more conscious of the breathing. To take a breath and push your stomach up you're fighting gravity, so it's a little more work (and may help strengthen those muscles) and similarly when you let go it's less effort to go back to the neutral position because you've got a gravity assist!