The EFX 544 is a great way to achieve cardiovascular exercise that offers an unprecedented range of variations on its no-impact, elliptical-shaped stride. On the EFX, you stand upright while striding in a forward or reverse motion and holding handrails, which are designed for ergonomic comfort and a wide range of handholds. The electronically adjustable EFX ramp changes the slope of the elliptical stride, letting you thoroughly cross-condition the large muscles of your lower body and achieve your desired heart rate quickly.