Sorry about the hotlinking bit, taking the image from an image search it did not have any copyright notices. I do respect copyright, but, this image is so freely shown.

Here is the pose again, courtesy of Hegre-Art.com for Ellen Nude Yoga. If its blocked again, the website address is http://www.hegregirls.com/models/ellen. But, do an image search on 'Ellen Nude Yoga', for body form a art its really good to show back curvature and twist.