This series/ instructor is wonderful. She is calm, statuesque, and patient - at the end of her workouts, you feel like you've worked oput with your best friend rather than having been pummelled by some hyperperky blond thing that makes you feel inferior no matter what you do. This series is perfect for all ability types because she is so good at explaining everything she does, and you can go at your own speed. I lost 12 lbs. the first 2 weeks and was amazed to find that one could sweat like a dog on the space of a mat...