I have KPC and love, love, love it. I want to get another cardio type workout. I am thinking alot about Cardio Kicks. Which of her step workouts gives a hard workout (ok, they all do!) but is easy enough to figure the moves in a few trys. I have endurance (ok on my good days I do!) so a long workout is great. I need to work my way up, learning her steps, to the more cordinated tapes. What do you sugest?