Planet Fitness is a chain of fitness locations designed to make working out easy, fun and comfortable for just about anyone. The gym is known for its "Judgment Free Zone," and local branches have been voted the Advocate's Best Fitness Center from 2005-2010.
Stop in at this branch and you can get a lot of information about the high-traffic times of day and a list of services without the heavy sales pitch. There are even one-day memberships if you're not ready to commit.