Cathe and crew certainly make it look easier than it sounds here (I've just previewed so far), but it's SUPPOSED to be anaerobic, isn't it.
Sounds like many of you (and me, I'm sure!) may have to work up to it, which IMO is a good thing. Just think if it were easy right off the bat: no challenge, no growth for the workout, and a very short life for it. And we get the thrill of accomplisement when we can eventually make our way through it more easily.