Zur Bedeutung des linken vorgestellten Beines beim archaischen Kuros

The representation of a figure with one foot forward signified the general potential for movement.
In archaic statues the advanced foot is the left, and this suggests another important aspect: the figure represents a man of action. The full physical energy of the active right arm can be exercised only when the figure is stepping forward with the left foot, for a firm stance. It is the stance of the warrior preparing a victorious strike and accordingly represents the highest state of dynamis.
Since the Kouros embodies the ideal of the martial aristocrat, this stance was highly suitable and thus became a conventional element of plastic representation.