I'm not sure if the B dimension affects exercise choice. If it does, it could be covered by providing a short list of exercises to try for activating each muscle group A. That way the user doesn't have to figure out which muscle(s) B are compensating, which could be challenging for a lot of people who need this information. In my case, I'm still not sure exactly how my body was compensating for the muscles in my back that weren't being utilized.