The aims represent an innovative approach to improving long-term mobility outcomes of patients with iSCI by applying selected principles of motor learning and exercise physiology yet untested in this population. Expected outcomes will be demonstration of the efficacy of a high intensity stepping training paradigm, with further understanding of potential underlying mechanisms and movement strategies used with improved locomotor performance. Successful completion of this project could have an immediate impact on rehabilitation research and treatment of people following iSCI, and may be utilized to treat more subacute patients with iSCI