at one of the last IDEA conferences, I took a session with Lawrence Biscontini and Bernadette O’Brien on exercises for seniors. They were combining exercises with some mental challenges which proved to be challenging indeed, particularly when you consider that they were presenting to fitness professionals. It was a unique blend of simple math and memory questions that were to be execute WHILE doing exercises. It was tough but it also was playful. Here is a link to the session http://www.ideafit.com/conference/sessions/bosureg-mobility-and-stabilit… . I believe there is a video out with that workout. It may be worth looking into.