When I am taking a break between workouts in the gym, I find a spot, sit and observe people. Often, it is to admire people's results of hours and days, and years in the gym, how their bodies are thanking them by popping them muscles.
Out here, vanity is usually defined by how one dresses, or what they (their face) looks like. In the gym, nobody remembers that the face is part of the vanity trinity because the sweat and the strange expressions from workout strains are constant. You cannot have a dignified face while in the gym.