Good, clean gyms in Corpus (preferably on Southside)?

Hi, I'm looking for a gym with free weights, not expensive, has good fitness classes (doesn't have to but that would be a plus!), and is clean. I would like to be in the Southside area. I've been told that Flex Fit on Saratoga or Freedom Fitness were ok, but I'm undecided. Help me choose a gym or tell me your experiences!