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 that positions machines inward so that you'll have a chance to laugh with your fellow fitness frontierswomen while raising your heart rate and burning calories with a complete aerobic and strength-training workout. Hydraulic resistance machines are 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 manoeuvring 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.