The Cybex Arc Trainer is a cardio machine similar to an elliptical, but the motion is slightly different, the foot pedals travel along an arc which provides a much more effective cardio workout and is a lot easier on your joints. Thanks to the "Balanced Loading Design" the Arc Trainer is easier on your hips and knees than other cardio machines. There is far less impact and stress on your knees than on a treadmill, and the arc motion is better for your joints than the elliptical motion. The Arc Trainer provides a much more effective cardio workout allowing the exerciser to burn up to 16% more calories than a standard elliptical workout. This Cybex elliptical provides a wide variety of pre-programmed workouts, or you can program your own custom workout routine into the machine thanks to the advanced interface.