I do Zumba 3x a week at the gym. Its fantastic. I agree that its only as good as the instructor though. The good ones make it great fun, the boring ones it actually feels like a work out. I also have zumba for the xbox (not as much fun as the classes at the gym but a good start if your worried about it). I had no coordination or rhythm when I began. I've lost 90 pounds (not just from zumba but it certainly has helped). My daughter and I have just been asked to start teaching the classes at the gym too