If all you want is weight machines and some aerobics classes, save your money and go to World Gym. For a more creative, personalized, healthy approach to wellness, check out Body Business. If you've already figured out that you need a little more variety to keep you interested, or that you need to avoid re-injury to your back/knees/etc, they have pilates, nia, aqua classes, and a few ideas I haven't seen anywhere else. I wish they had more weekend and evening hours. Still, for keeping me motivated and being well-suited for demographics beyond the 20-year-olds-in-perfect-health, they're the best thing in Austin.
Pros: classes, instructors, pool