I've tried Shiva Reas's Prenatal Yoga DVD and thought it was way too slow and easy (even though I'm not even that advanced or fit) so when I did Dr. Christine's Dynamic Prenatal Yoga DVD I was extremely pleased and relieved to find something both enjoyable and that made me feel like I got some decent exercise. I'm in the middle of my second trimester and will definately keep using this DVD for the next 4 months and probably even after the birth.