My first IMAX was #2. Then came IMAX4 for me. I needed to upgrade my VHS Rhythmic Step to a dvd & got the original IMAX with it. I so enjoyed having 3 IMAXs that I ordered IMAX3 so I could do one a week for a month rotation like this one. I modify them to lower impact too, but I love the format! There's also a calorie crush bonus on LITE Cardio Party (I think it's that one) that's IMAX-ish.