I found there was a conspicuous absence of cardio on Step 2. Obviously that was my experience, but I don't think it would be necessary to go out and find a book for that topic in particular. I'd suggest breadth of knowledge in all the disciplines rather than mastery of any particular one. Health maintenance is huge on Step 2, hence the praise for Brochert's Crush review.
Good luck, hope this was in time to be of some benefit.
Bartholomew the Cat
