MIC, in my opinion. I love/hate this workout. I don't find the hi/lo section to be very comfortable; it's very jerky and fast. The sashays at the start of the step section drive me nuts; I can't stand them. But I persevere, because I love the way I feel at the end of this workout, and the Blast at the end is sheer fun. I really like the music she uses for the blast, and I am always amazed at where this workout has taken me - from those basic side steps at the start, to all those jumps at the end.
Interval #4 in IMAX is also pretty intense, and makes interval #5 quite a challenge (who wants to do *another* 16 plyo-jacks?!).
BodyMax is also a challenge, because she goes so fast!
I agree that Step Works also qualifies as a cardio challenge, particularly the first segment that seems to go on and on. And who can truly forgive Cathe for her little lie at the end of the second section when she says "that's all there is", and then throws in all those abducter moves and knee-lifts? Oh, she's a tricky one :7
Cheers,
Sandra