answer: Nathan tells #Person1# he doesn't like gyms because they are just socializing places.
documents: #Person1#: You look so fit, Nathan? What do you often do at the gym?
  #Person2#: Well, I try to work on specific back and lower back muscles with barbells. But I don't like gyms so much, you know.
  #Person1#: Why not?
  #Person2#: Because I find that many gyms are not really gyms, there just socializing places. You just sit on a machine and talk with others for like 45 minutes, 
  #Person1#: Uhh, I see.