I'm in Chicago as well. If you can't get to a gym and/or don't have equipment at home, try shoveling snow. I made up a stack of flyers for car and walkway snow removal and hung them on the front doors of the condos and townhouses down the street from me. I've made over $400 already. I had six calls before I woke up yesterday morning at 6:30. Seven more today and more to come!