My friend Jason did yoga on the PX90, or whatever it's called...lol. I don't know if it was the yoga booty. BUT, only within a few weeks...his arms started looking REAL GOOD! His wife had no idea that yoga could make your body look so good...she was pumped. You could really notice the difference.
Haven't done it yet, I just finished Insanity and started ChaLEAN Extreme....I'm adding TurboJam to it and then TurboFire. I plan on taking the TurboKick Instructor certification in the Fall and need to learn the moves, lol.