I think this a tough question, and I hesitated between a) and b), but I choose the second answer - Physical Therapist.
Physical Therapists are licensed providers of care, and their educational education has evolved to the point where physical therapists graduate with a doctorate in physcal therapy. Personal trainers have a degree or a certificate. This is not the same.
High heart rate is not a symptom of Anorexia Nervosa.
It's also known as the "Thinking person workout".
It is true that aerobic endurance is good cardiovascular efficiency.