I’m right there with Joanne as well.
IDEAFit’s “Articles” section has a massive amount of articles available for members to read whenever they like. This aspect of the site is actually one of the main reasons I have no problem renewing my membership year after year.
Out of curiosity, what information regarding the “core and shoulder girdle” are you specifically interested in? If you wouldn’t mind clarifying your actual question(s) perhaps I could provide some additional links to related articles/books/blogs/etc.