www.xsportfitness.com They are all around, the one location I heard where all the chicks are is at Logan Square. But that's a cruise from Rogers park. They are open 24/7 and you can get a monthly pass for around $21 or $24.
What he said, I goto the Xsport Fitness in chicago ridge. Can't beat having everything you need along with 24/7 and 365 day times. Christmas, New years, or whatever you can always go whenever which sold me on it when I started going to that gym about 4 years ago.