It is all the animated demos.
Here is the path that I am following:
my alli plan>my activity plan>edit/view plan (under strength column)
There I can see a list of strength exercises (chest, back etc.) There are no recommendations asto which of these I should do. Additionally, when I click on the links reading "animated demo" I get the "sorry, there is no information on that exercise" error message.
A couple of weeks ago, there were exercise recommendations and I was able to view the demos.