What side of town are you in? The Mecklenburg Aquatic Center uptown is available
Aquatic Center Information (http://www.charmeck.org/Departments/Park+and+Rec/Aquatics/Aquatic+Center+Information.htm - broken link)
Ray's Splash Planet, also uptown area (not just for kids)
Park and Rec Ray's Splash Planet (http://www.charmeck.org/Departments/Park+and+Rec/Aquatics/Rays+Splash+Planet/Home.htm - broken link)
Marion Deihl Center
Marion Diehl Center (http://www.charmeck.org/Departments/Park+and+Rec/Aquatics/MarionDiehl.htm - broken link)
as well as Fitcare (I think that's what it's called) up in the Huntersville area
and the Jewish Community Center
Fitness Center