A kinematic system is described. The kinematic system includes a kinematic device to train a subject to move in an optimal form during functional activities. The kinematic system comprises an attachment mechanism, a projector to project a first light line along a first axis and a second light line perpendicular to the first light line, and a multi-directional joint. The kinematic system works such that when the subject performs functional activities, the functional activities comprising one or more of taking a step, sitting down, standing up, walking, running, cutting a corner and ascending or descending steps, a movement in the line of light indicates rotation, anterior-posterior tilt, abduction-adduction, flexion-extension and lateral tilt of the users joint, enabling correction of movement associated with the functional activities to the optimal form.
