The invention provides a retraining system that requires EM sensors, programmable computers and mechanical structures that are controlled by the programmable computers so that injured body parts of injury subjects are moved by the mechanical structures. The retraining methodology proposes the use of electromyograph (EMG) signals from a healthy subject having a healthy body part to control the mechanical structures that are coupled to the injured body parts of injury subjects. As part of the retraining system, the EMG signals of the same injured subject are also sensed by an EM sensor coupled to said injured subject in order to move the mechanical structures coupled to the injured subject. The system is calibrated to store in the programmable computers specific motions associated to the EMG signals of the healthy subject and to ensure that the EMG signals of the healthy subject and the EMG signals of the injured subject are significantly matched. Also, the system provides that the EMG signals of a single healthy subject can be used to control the movement of a plurality of mechanical structures coupled to a plurality of injured subjects to offer a group therapy session.
