I think I got why the old model for gyms doesn't work, it's because what they really want is for people to buy a membership and then never come, that's how they make money, so without meaning to that's what they accomplish. Most people regard gyms as a place to be seen, but they can be seen and admired just walking down the street, so why should they come to the gym, they don;t actually need it. I would make a gym where you can't come in without an appointment, and there's lots of stations, each station has a smith machien and two dumbells where you can change the weight so you only need 2... your trainer takes you to a station, goes through a workout with you, or tells you to go do x amount of cardio, and ur finished and u leave... that's the ideal gym imo