C-Mill. The C-Mill is a 3-m long instrumented treadmill with visual objects such as stepping targets and obstacles projected on the belt to facilitate practice of foot placement relative to environmental context. A force platform is embedded in the treadmill for real-time determination of gait and foot-placement positions, allowing for various gait adaptability interventions accustomed to an individual’s gait. The visual context is projected on the belt’s surface, approaching the patient with the speed of the treadmill belt. The handrails permit weight-bearing and allow early training in a safe environment.