Motion training aid

A motion training aid system for a person or animal to train bodily movement is provided. The system includes a motion sensor unit that attaches to a body part of the person or to an implement used by the person, a processor, and a stimulator attachable to the body of the person that receives a command and elicits a stimuli perceptible by the person. The motion sensor unit provides motion data to the processor, and the processor, based on the motion data from the motion sensor unit, tracks three dimensional positions of the motion sensor unit. The processor compares the motion sensor unit position with a reference track, and depending on the motion sensor unit position relative to the first three dimensional track, sends to the stimulator, a command to elicit an electrical stimulus when the motion sensor unit has reached a predefined deviation from the reference track.