I saw this video by Rebecca Leone today about her views on c-curve and what kinds of flexion we should be practicing: https://vimeo.com/32061652

Since I have disc degeneration, I have a keen interest in these questions, and her video spoke to a lot of my concerns both as a practitioner and as a future instructor. I'm curious about other people's points of view on the topic.

Oh, and I should add that the opening of the video is quite long, but she does eventually get to showing "the wrong way" and "the right way" for all of the exercises.