Free Sat./Sun. morning yoga classes at Lululemon

Lululemon holds free all level yoga classes at their stores on Fri. or Sat. mornings, depending on store locations. The yoga classes tend to be great as Lululemon picks some of the best instructors in their areas to teach the classes.
You can look up store locations here: Lululemon Store Locations
Also, most stores hold all kinds of aerobics, pilates, dance, etc. classes midweek.