What's the history of the gym (not the home gym. The "hey, I'm going to the gym tonight" gym)? When did weight lifting become popular in the United States? The 50s? Before? I imagine that men had gyms in their basements in the early part of the 1900s, and I understand that health and fitness fads have come and gone throughout the centuries... But, I wonder when it became part of our society to go to the gym to work out.