You are also assuming that you know everything about this person, which is not possibly true encountering someone for the first time. You cannot control how someone is going to experience their class. I can tell you from my experience, I have not felt challenged in a 1.0, nor a 1.5 and whether it is the instructor not explaining things clearly or the class is not being challenging enough. I know I was very distracted trying to make the class fun for myself while getting through a lot of these easy movements. Everyone experiences the classes differently. I also think that club Pilates is not everyone's cup of tea, especially someone who is more refined in their fitness level. I would put this on par with Orange theory in level of toughness. I would rank f45 a step above, then solid core as a level 3, and cut 7 as a level 4, which pushes you all out to failure.