spine-loosening?

I seem to like cracking my neck sometimes. Maybe it's just a bad habit that comes out more when I have a hit of Salvia D., but I don't think so, because most habits of the body, personality and ego seem to drop away when in the Salviaic-trance. Muscle tension does not necessarily leave in a mild dissociative trip induced by a kappa-opioid receptor agonist (Salvinorin-A), but it becomes easy to actively release most body tension just by lying down and letting-go. However, the neck and spine tension in the body seems to remain. So I sometimes think "if I could just loosen up these vertebrae, the person who normally inhabits this body might have a better time living in it." (It's sort-of a subtle joke about the dissociated state to think of myself as a different person when under the influence of Salvia. But since most aspects of the personality temporarily seem to be "gone", including all the resentments that may cycle through my head much of the time, it feels literally true, in a way.) Anyway, it may or may not be a profound realization, but I feel convinced that spinal-loosening exercises (yoga, perhaps?) can improve the whole body's functioning. After all, the nervous-system branches out from the spine, and if the spine is sending pain signals due to tightness in some areas, that must tend to negatively impact the consciousness of the person inhabiting the organism (the body.) Now, I do notice, many constant discomforts become suppressed, then awareness returns to them in the Salviaic state. That's probably why it occurs to me to loosen up my neck and upper-back spinal area when in that state.

This has some good exercises:
http://books.google.com/books?id=1kJiDxQ18BgC&pg=PA130&lpg=PA130&dq=spine+loosen&source=bl&ots=h4VAQSsVoQ&sig=T7Xri-XKwixzeJYNZ7WIIpxEoCU&hl=en&ei=RINATqfnPOPgiALQh-nJBQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwAA#v=onepage&q=spine%20loosen&f=false