Tom Gellie shows why your inside ski skids when carving and how to fix it. The problem: when you lift the inside ski, the tip drops and the foot goes flat. Solution: engage your ankle to level the tip, match both skis' edge angles, and keep the inside foot slightly active so both skis carve clean parallel tracks.
Chapters
Have you ever watched really good skiers and noticed the tracks they leave are two pure lines when they're carving? The outside ski and the inside ski both cut a really nice groove in the snow. Have you ever looked at your tracks, particularly your inside ski? I see so many intermediate-advanced skiers with a skidding inside ski. You're going to lift up your inside ski. If you do nothing but just take it off the snow, You will find the tip of the ski probably wants to hang down, the foot is flat, and there's not much tension in the ankle. What have you got to do to make the ski level? Got to engage my ankle. Now simulate a little bit of edge angle. I'm going to do the same thing, lift it up. Now what have I got to do to match the edge angles? There's this activeness of the inside foot, even though it doesn't have much pressure on it, in order to keep the edge angle similar keep the rotation alignment the same and give your skis a clean edged track.