I love your challenging questions. So here I go:
I found that FM can be very different things for different people. In fact, at the Personal Trainer Institute, Cassidy Phillips mentioned that he has been diagnosed with FM, but his approach to training himself would not jibe with those people who I know with the disease.
When I train a person with FM – after having done an assessment – I usually start with rather easy exercises and a lot of stretching. I found that many people with FM have lost the trust into their bodies, tend to be rather de-conditioned and are often very scared of exercises for fear of pain. As I am a MELT instructor, I find this method absolutely wonderful for FM as it encourages self-assessment and re-assessments after some movement of self-selected intensity. Thus, I observed that a gentle approach on all levels is a must. Which exercises to select almost becomes secondary and should be informed by the results of the assessment.