Curves houses a circuit of hydraulic resistance machines designed to work with women's bodies to promote weight loss, protect against osteoporosis, and cope with arthritis. Instead of guests fiddling with weight stacks and losing momentum, the hydraulic machines use body weight and fitness level to create resistance that matches each exerciser's abilities. Because traditional lift-and-lower motions create bulky muscles, machines use push-and-pull motions to create toned, lean muscles perfect for crushing a grapefruit without looking like you can. Every thigh- or torso-transformer is equipped with the CurvesSmart personal-coaching system, which uses programmed information on weight, endurance level, and fitness goals to automatically calibrate the perfect challenge for individual bodies. The CurvesSmart system also delivers a postworkout rundown on the strength built and progress achieved during each session. An experienced trainer is always nearby to help manage machine-maneuvering and to squirt overheated guests with a Super Soaker.