The two gorgeous (and thin) ladies who launched theSkinny Bitchphenomenon are now putting their legwarmers where their sassy mouths are. This workout, a dance-routine with several options, is a great overall workout that really is fun to do. The authors/class leaders, Rory Friedman and Kim Barnouin, are not professional dancers, and freely admit it--which is part of what makes the workout so fun. The women seem to be having a blast as they add on Jane Fonda-esque moves, building to a very decent cardio workout that targets the rear and the core. "Every woman, no matter her shape, as long as she loves herself and takes care of herself, is a skinny bitch," insists Friedman during the workout. While the phrase may sound harsh to some, clearly it's a motivator and term of endearment to the wildly successful authors--who sweat up a storm on camera along with the rest of us. The routines include a comprehensive warmup, and then a choice of an '80s-based aerobics routine or a more contemporary hip-hop workout, which can be combined or done separately. Those with joint issues will want to wear shoes throughout the routine, though it will make some of the balletic moves a little more challenging.  Extras include interviews and outtakes with Friedman and Barnouin, for those who can't get enough of the Skinny Bitch philosophy, and an extremely helpful interview with the mastermind behind the routines, fitness trainer Patrick Goudeau. --A.T. Hurley