Competition is only real when a significant number of your potential customers know of it. It sounds like a relatively small percentage of people know of mindb

Competition is only real when a significant number of your potential customers know of it. It sounds like a relatively small percentage of people know of mindbodyonline (obviously the groups you have talked to haven't). So the only danger is if both that company and your company become huge; and that's not something to be worried about now.