 Patients will receive 12 training sessions over 4 weeks 3 sessionsweek of RAGT. During these sessions subjects will wear a harness attached to a system to provide body weight support and they will walk on a treadmill with the help of a robotic-driven gait orthosis. The legs are guided according to a physiological gait pattern. The torque of the knee and hip drives can be adjusted from 100 to 0 for one or both legs. The speed of the treadmill can be adjusted from 0 kmh to approximately 3 kmh and body weight support from 0 to 100. During the first session we will set these training parameters according to subject characteristics and demand level. As training will progress, adjustments in the assistance provided by the driven-gait orthosis, the amount of body weight support and treadmill speed will be performed. Training sessions will last for an hour with 30 minutes of real walking time, because subject set-up in the device take approximately 30 minutes. 