Six Star Certification, derived from extensive biomechanics research and user testing, is a combination of key elements needed to deliver the smoothest, most natural feel. ZERO gap overlapping pedal motion eliminates stress on hips and back. Straight UP body posture keeps your body upright for maximum comfort and minimal fatigue. Low, 10-inch step-on height to make it easier to get on and off. Optimal handlebar spacing puts grips within ideal reach and distance for most users. The 18-inch FLAT ellipse foot path provides a more natural foot path, mimicking walking and running motions. The large drive pulley ratio increases momentum so you get a smooth, efficient motion. 10 Program Options: Manual, Weight Loss, Weight Loss Plus, Intervals, Intervals Plus, Constant Watts, Rolling, Reverse Train, Random and Calorie Goal programs, add variety and intensity to your workout. Sonic Surround Speakers, in addition to quality speakers, the console includes an MP3 input for playing your favorite workout music and a headphone output for privacy. Frame Design All-access. The front-drive design and low step-on height combine to make users more comfortable and confident. Drive System dependable performance. A heavy-duty flywheel and magnetic brake resistance provides smooth, quiet and consistent starts and stops. Stride and Pedal System natural advantage. A long stride and pivoting foot plates match your natural motion for more comfort and less recovery time.