Quality meets value: a great place to start. SIXSTAR Certified™ frame: Derived from extensive biomechanics research, SIXstar Certification™ is a unique combination of the six key elements needed to deliver the most natural elliptical feel available. It focuses on all areas that impact the feel and comfort of an elliptical, including body positioning, handlebar spacing, elliptical foot path, pedal placement, elliptical access and the trainer's drive mechanism. More options for better results: A long, 20” stride length provides a wider range of motion. This, paired with a flat ellipse shape, recreates natural walking and running motions for users of all heights.