The problem with extend to change edges is that it often drives the CoM inside rather than allowing the CoM to move inside as the feet travel away from the body. Perhaps a better way to think of it is that the lower body leads the way. You want the knees to move in first. As the feet then travel out, the pelvis can move toward the snow (e.g. down, not in). The pelvis and upper body winds up inside not because they traveled there, but because the feet traveled out.
My favorite video:
Mike
My favorite video:
Mike