Inclusion Criteria:  Adults ages 18 years and older All demographic groups will be invited to participate and would have equal access Post-TBI individuals currently enrolled at the Moody Neurorehabilitation Institute Ambulatory with or without assistive devices Subjects with expressive aphasia in the case of a caregiver able to provide assistance when needed English-speaking only Medically stable (controlled hypertension, no arrhythmia, stable cardiovascular status) Able to provide written informed consent  Exclusion Criteria:  Subjects with loss of lower limb History of serious cardiac disease (e.g., myocardial infarction) Uncontrolled blood pressure (systolic pressure >140 mmHg, diastolic blood pressure >90 mmHg) Subjects with receptive aphasia Presence of cerebellar and brainstem deficits Severe cognitive disorder Uncontrolled respiratory or metabolic disorders Major or acute musculoskeletal problems Spasticity management that included phenol block injections within 12 months or botulinum toxin injections within 4 months of the study Participants undergoing any rehabilitation therapy during the timeframe of this study. Body weight greater than 250 pounds (due to robotic device weight restrictions) Non-English speaking individuals