Also, as the skis is light on snow in transit between turns (or even floating in high performance skiing) it is very easy to pivot the skis when focusing in femur rotation, in case of the strong muscle of upper leg are not more more precise than exact the small muscles in the foot, so if we're looking for a clean switch of the edges, again focus should have on the feet and ankles.
Also, as the skis are light on snow in the transition between turns (or even floating in high performance skiing), it is very easy to pivot the skis when focusing on femur rotation, because the strong muscles of the upper leg are not as precise as the small muscles of the foot, so if we're looking for a clean switch of the edges, again focus should be on the feet and ankles.