Hi, Katana,
Have you looked into hula hooping? I believe it's the same motions as twisting, per Pinnochia's threads.
With a weighted hula hoop, it would also be like a foam roller session, I think....
Glutegirl (glutegirl3.com) had some info on that, try
Glutegirls Hula hoop.
I'm finding that calisthenics is going to be best for all of us, making strong, lean, flexible muscle. I like weights, but watching Strength Wars on youtube, and seeing the differences in the flexibility and control, plus the difference in the build...? Calisthenics, yoga, pilates, etc. works better for feminine strength and flexibility. In similar vein, the Hula Hoop exercise would help a lot, especially for us born male, to develop flexibility in the hips and narrow the waist over time...
And you have a head start due to your genetics, so...
I'll see about purchasing that program over the weekend.
-Dianna