AS is really fun, and definitely easier to learn. It ends with some leg work just like LIC, they are both very close in length (47 min vs 50). I think LIS seems harder as far as choreography because Cathe turns her back in combo 4, and she moves quickly through some of the combos because there are familiar moves that have been done on previous workouts, but just done in a different way. Athletic Step involves a little more jumping. Both are extremely fun!! You can't go wrong with either. You might want to preview LIC a few more times to help you get the combos down. Once you get it, you will really enjoy it!!