Have you tried the fitness-ballet workout? They seem to be a really hot class right now. Here are a few that look interesting:
Ballet Barre Workout (a DVD)
In Kansas City: Fusion Fitness, Personal Best Pilates, and "Fitness Ballet" at Lifetime Fitness.
In NYC, Physique 57 has been around quite awhile and is still uber popular, and I'd love to try a class at Beyond Barre.
First post about the Ballerina Project here. Support the Ballerina Project at BallerinaProject.com. Photos via BallerinaProject.com