Hi there!
I just LOVE SB and for some reason, it was easier for me to WATCH what she does instead of LISTENING to her instructions for a few tries til I got it down pat. Honestly, though, I spent a week going over the first 3 sections before I could attempt the entire challenge! LOL
Now, for me, Imax3 took me FOREVER to get down! I felt like I was studying for college final exams with the way I had to sit down and watch the moves, rewind, etc... I was totally having panic attacks with this one. Maybe b/c it was my first Cathe. Now, it seems that every other workout of hers I do, I see parts of I3 in it! LOL
HTH!