Human motion is the result of the muscular contraction and difficult to measure since muscular contractions are hidden and only surface motion could be observed. Simulation of human motion is the subject of study in a number of disciplines: Biomechanics, Robotics, Computer Vision, Control Theory, Neurophysiology, Medicine, Ergonomics .Since the author has never visited any of these fields, this review is indeed a passer-by's impression. On the other hand, he happens to be a human (who occasionally is moving) and, as everybody else, rates himself an expert in Applied Common Sense. Thus the...