I recently took some lessons and my instructor left me with 2 drills to work up to, one is lifting the inside ski and two is the entirely one footed skiing. I am now able to lift the inside ski and ski only on the outside ski and can do it ad infinitum but I am not able to do the 2nd drill. It appears I am not able to balance on the outside edge of either ski only on the inside edges. If I force it, I pretty much instantly fall over. Is there some intermediate drill I can do to develop that balance before I move onto entirely single footed skiing? And as an aside what is the benefit of doing these drills.