This document summarizes research on robotics and rehabilitation devices for locomotor training. It discusses how body-weight supported treadmill training and robotic gait trainers have expanded access to gait practice but that studies found they were not more effective than other intensive therapies. Researchers are working to improve devices by making training more challenging, engaging the brain more, and requiring more patient effort to maximize the benefits of motor learning and recovery. The future of rehabilitation devices may involve adaptations that dynamically respond to individual patients' capabilities.