Compared to what???}(
I think the lowest intensity Cathe tapes are CTX Kickbox, CardioKicks if you dont really try to put a lot into it, Cardio and Weights and Step Heat. But they are all still advanced. Of course, you can do the strength tapes like MIS and PowerHour with low weight and they won't be too intense either. My sense is that Cathe only makes high intensity tapes as that is her target market.
I don't have the really early ones. I hear people on this forum also say that StepMax, The Wedding Tape and Step Jam aren't too terribly hard either.