i just did this yesterday! around circuit 3 i always think i'm gonna die and then she brings it down to the floor and i'm like THANK GOD!!!!!
anna does circuit training too and it really is effective stuff. i've been alternating between that, my hip hop dance cardio workout, body pump and jogging. i can't work out every day though - just don't have the time. i usually try to get in at least 4 workouts a week and try to mix them up, depending on my mood. i think i'm gonna go get that other jillian DVD though.