I just recently purchased MIS, and just loved it. Before purchasing this tape, I worked out with The Firm's exclusively. I really like Cathe's style and would love to incorporate some of her cardio tapes or strength/cardio combo's into my workout. I love The Firms Cardio Step Mix, but am getting bored with it. Only thing is (bummer) I have a sensitive knee and can't handle too many high impact moves. The thing that really gets me is plyo's, jumping, etc. I usually modify these into squats or stay grounded instead, but I don't want to have to modify a whole tape! From what I've read, most of her cardio tapes are hi impact. Is this true? If not, which would you recommend? I prefer Step Aerobics over floor routines. Thanks for the input!:7