Spinal Stimulation and Mobility Devices

Inclusion Criteria: * have a neurologic condition * are 4-70 years of age * have stable medical condition * can perform simple cued motor tasks and who can follow 2-3 step commands * who are volunteering to be involved in this study * can provide feedback on comfort and experience during lab visits Exclusion Criteria: * have significant medical disease; including uncontrolled systemic hypertension with values above 170/100 mmHg; cardiac or pulmonary disease; uncorrected coagulation abnormalities or need for therapeutic anticoagulation. * have cardiovascular or musculoskeletal disease or injury that would prevent full participation in physical therapy intervention * have a history of uncontrolled seizures * have unhealed fracture or other musculoskeletal impairment that might interfere with lower extremity rehabilitation or testing activities * are dependent on ventilation support * have implanted stimulator (e.g. epidural stimulator, vagus nerve stimulator, pacemaker, cochlear implant, etc) or drug delivery device (e.g. baclofen pump) * have history of orthopedic surgery in lower extremities or neurosurgery that may be a confounding factor for interpretation of the results (such as tendon transfer, tendon or muscle lengthening for spasticity management, injection therapies to lower extremity muscles, etc.) in last 12 months * have established osteoporosis and taking medication for osteoporosis treatment. * have rheumatic diseases (rheumatoid arthritis, systemic lupus erythematosus, etc.) * have active cancer