I have a really whacked out back and hips. I'm extremely wary of aggressive yoga style stretches until one is quite advanced. I've been injured in every yoga class I've ever done. IMO I'm sure yoga is great for fitness..I just don't happen to believe its for rehab.

That said...here are my faves. They are really gentle. Not meant to be aggressive or painful at all If you go to this website...find HIP FLEXOR STRETCH, PELVIC TILT EXERCISE, and PRESS UP BACK EXTENSIONS.

This one for the lower glutes has been great for my back.

My 2c