I pay roughly 50$ a month at my gym, which actually pretty cheap, since they have a huge area with thread mills, excercise bikes & the likes (and 6 tv screens & a 3x3 foot screen - all tuned to different channels), a huge area with various weight lifting devices, a huge area with various work-out machines and 4 different rooms dedicated to different sorts of workout programs (ie. Spinning, Boxing, Yoga, BodyPUMP/BodyCOMBAT etc.). On top of that, each month, they have various activities you can sign up to, for free. That includes the best way to train muscles, the advantages of a varied excercise program, BMI measuring etc.
Not to mention, there's a fully equipped pool area with spas, saunas & steam room
I tend to go there 4-5 times a week, since I do spinning 3 times a week and general workout/weightlifting the other days.
But the best part, is that everybody knows everybody - so in two weeks, we're having a party for the people on the spinning team. Of course, that also means that if you skip training for a day or two, everybody is going to be asking where you were
EDIT: Of course, I could "just" go for a run, walk or a ride on my bike, but then I would miss out on the social aspect of going to a gym, where you know a lot of people.
[Edited 2004-05-04 03:10:06]