It is a great, reduced-impact workout that really helps you relax.
Here's a new pose "crescent to warrior" http://tinyurl.com/ygh5vrx. This post features a video. Give this one a try from http://www.thatsfit.com/ to tone and strengthen your glutes and legs.
If this works for you, check out the Fit Mom's Blog at http://tinyurl.com/ygsehg5 to learn more about Trudie Styler's "Warrior Yoga" video. Looks like a great workout!