As I'll be soon moving to downtown Boston (South End, of course), I was wondering if anyone here goes to the following gyms: 1) YMCA at Huntington Ave; 2) Boston Sports Club at Harrison Ave; 3) Zumba Fitness Boston at Massachusetts Ave; 4) South End Fitness Center at Hampden Str. I heard a lot of good things about Boston Sports Club, but it's way too expensive. Would love to hear about their pros and cons from people who actually been to these gyms. Thanks.