Jazzercise National, Knoxville

While teaching jazz dance in the 1960s, Judi Sheppard Missett decided to step away from tradition by offering an experimental class that allowed her students to simply dance without the judgment of mirrors or the constraints of rigid technique. In these sessions, she began infusing popular dance moves with specific fitness workouts to forge a distinctive blend of cardio exercise, strength training, and dance instruction. Little did she know that this “just for fun” class was the prototype for what would become the national fitness sensation known as Jazzercise.

Today, Jazzercise takes its aerobic techniques from a variety of sources that include jazz dance, hip-hop, resistance training, Pilates, yoga, and kickboxing. The class formats, which vary according to different toning goals, are just as diverse as the program's move set. Two-time Dancing with the Stars champion Cheryl Burke is a big fan of the improvisational routines, although her advanced skills aren't needed to get the most out of classes. Instructors cultivate a noncompetitive atmosphere where all exercisers—with the exception of those marked as cursed by jazz-hand palm readers—are welcome regardless of age, build, or fitness background.