Hey..I don't get who from your fitness center would send your T a message tell her you haven't been working out. Unless you had to fill out some forms or get "special permission" or what have you. Anyway, I agree with the others that its worth talking about how freaked you are about her calling you. I've been seeing my T for 2 years and she called twice in 2 years to just check on me after very difficult sessions. We talk more than that outside of session, but that's because I initiate a text message to her. If you want that boundary with your T, then it starts with you going in and talking to her about it. You don't have to return her call if you don't want to.