What would you rate the worst massage you've ever had?
What made it the worst?
What would you rate the best?
What made it the best?
Was the best massage from your usual massage provider (if you have one) or from someone else?
If you have a regular provider, why THAT PERSON?
If you use various therapists at one location (such as a massage franchise or gym), why that location?
What would get you to change places/providers?
(If you go to someone because they're a friend / family member, pretend they're not tp answer that last one.)