The ElliptiGO elliptical bicycle has been designed to provide an outdoor, running-specific, low impact cross-training option for injured and healthy runners. Previous research has shown up to 79% of runners had experienced a running-related injury in a 1-year period (van Gent et al., 2007). This finding is substantial, but not surprising for runners who incur large impact forces, up to 2-3 times your body weight every step over the course of each run. This repetitive impact has been seen to be linked to the high injury rates in runners (Hreljac, 2004). Once injured, a runner has limited options to maintain fitness and performance levels without incurring further injury.