With machines set up in rows to encourage competition, many ordinary gyms cater to men's bodies and psychology, right down to the urinals that were "accidentally" installed in the women's locker room. At Curves, you'll move around a circuit of hydraulic-resistance machines that have been designed to work with women's bodies and promote weight loss, protect against osteoporosis, and deal with arthritis. An experienced trainer is always nearby to help manage your machine-maneuvering and your muscle-making. Instead of fiddling with weight stacks and losing your momentum, the hydraulic machines use your body weight and fitness level to create resistance that matches your abilities, decreasing the risk of soreness or injury. Because traditional lift-and-lower motions create bulky muscles, each machine uses push-and-pull motions to create toned, lean muscles perfect for crushing a grapefruit without looking like you can.
Today, it's undeniable: Jazzercise is a worldwide empire, spanning more than 1,800 locations and 32,000 weekly classes across the globe. It's also hip; gone are the leotards and legwarmers of the 1980s, replaced with a high-intensity blend of cardio, strength training, kickboxing and power yoga performed to hits by chart-toppers from Shakira to Justin Timberlake. The class formats, which vary according to different toning goals, are just as diverse as the program's move set, with recent additions such as Fusion, Core, and Strike broadening the workouts' variety and application. Instructors cultivate a noncompetitive atmosphere where all exercisers are welcome regardless of age, build, or fitness background. This sense of community keeps Jazzercise devotees coming back, but so too do the results; benefits ranging from weight loss and boosted core strength to increased flexibility and stress relief.
Jazzercise's continued success can be traced to the innovation of its founder, Judi Sheppard Missett. While teaching jazz dance in the 1960s, she 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. Little did she know that this ?just for fun? class was the prototype for what would become the Jazzercise sensation.