Me too! I just tried this workout yesterday and I could only do a couple of those abs, while Cathe and crew make it look so easy.
The other exercise I find impossible is the one in the core workout where you sit with legs crossed and try to hold your pose with air under the bottom like a genie on a magic carpet minus the carpet. Well, I need the magic carpet for sure, because my arms would need to be tree trunks to hold up my behind. okay, maybe I am exagerating a little---maybe.
I hope there are suggestions out there!