The Matrix E5X provides a comfortable, low impact, effective workout. The E5X does not require a power outlet, and the brushless, maintenance-free generator provides power the moment you begin using it. The 21" stride accommodates all body sizes for a comfortable, efficient, and natural workout. Dual action (both pedals and upper handles move together). The cushioned/shock absorbing foot pedals make this the smoothest most comfortable stride. This machine offers the most natural feel for both forward and backward motion.