 Locomotor Training: Every research participant will be slowly acclimated to the body weight support system to make himher feel comfortable in an upright position. This may help the research participant avoid experiencing a lowered blood pressure or dizziness. However, if these conditions should occur, the research participant would immediately be unhooked from the system, removed from an upright position, the legs elevated, and the blood pressure monitored. Stepping bouts are relatively short in duration, thus an increase in respiration as well as an increase in heart rate or blood pressure will generally last for only a couple of minutes. Each research participant will be closely monitored through each experiment and training session. Standing or stepping will immediately halt once the research participant feels tired or winded. Blood pressures heart rates will be monitored by the PT or trained staff regularly during each training session. Continuous blood pressure, breathing rate, and temperature may be monitor with sensors throughout the training sessions and experiments. Participants may train 2x a day, they will train both to stand and step on the same day. The sessions will only be counted if the progression criteria are met, for example independence minutes or weight-bearing minutes. 