To tell you that everything you are doing in your workout is wrong, whether it is how you are doing the exercise or your entire workout routine? I'm guessing this is their sales pitch, to tell you that "you are doing everything wrong but if you pay me $60 for a one-hour session I'll show you how to do it correctly". God damn it, these people are more annoying than used car salesmen. Just leave me the fuck alone. As long as I am losing fat and gaining muscle, I must be doing something right.