 If any signs of risks or discomfort are noted, the experiment or training session will be immediately discontinued. If any complications arise, the stand or step training will immediately stop and Dr. Williams will immediately be informed. In addition, the research participants primary care provider will be notified as necessary. Dr. Williams will be the medical advisor for the research participants throughout the LT segment of this study. Dr. Boakye will oversee all surgical related issues for the research participants. 