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 circle of hydraulic resistance machines 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 machine maneuvering and muscle making. Instead of fiddling with weight stacks and losing momentum, the hydraulic machines use body weight and fitness levels to create resistance that matches 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.