I'm going to echo Kneale's post. But first I want to share a visual about one aspect of strong skiing. Here are some stills from the last section of the clip:
Angulation measured below 155 just looks like good skiing. Angulation in the low 140s starts to look like good racing.
Notice the upper body lean into the new turn
Notice the positioning of the hips more over the uphill ski
Good recovery - now you're driving forward
Strong finish to the turn. You park and ride a bit to get around the tree. Your hips get stuck in this position for the start of the new turn.
Look at the head angle. Downhill hand and upper body rotation initiate the new turn.
5, 4, 3 ... (reaching)
1 ... leaning
then whammo - edge change in the new direction
In pic1, you are at the point in the turn where you should be "steering" into a new countered position (letting the skis turn more than the shoulders). But you don't. So you end up in a position like pic #2 (ok this is an exaggeration, but there are many other similar positions earlier in the clip, just not as extreme). Notice how far your hips are away from the inside ski in pics 2&3. From there, you have to throw your upper body down the hill to get mass to the inside of the turn like we have in pic 4. And that lets you get the strong finish in pic 5.
Pic 6 is a slightly different variation on the theme. By doing a pole touch without an accompanying hip movement into the new turn, you get the right hand/arm opening up screen door style from the body and the upper body pulled into a lean. This allows the sharp Z turn that follows (pic 8).
Yes, there are bumps underneath this soft snow. Yes, these sharp edge sets and quick pivot turns are effective in the bumps. And yes, snow this deep is not easy to ski in. Yes, these are very nice turns. Yes, I cheated by taking stills from a difficult steep and narrow section. But in snow this soft, you can ski more efficiently and smoother (to whit we have Schanzy). To get to the next level you got to have the hip movement during turn initiation. As Kneale has noted, you won't get the hip movement without the ankle movement. But ankle movement is hard to see in stills or on video and if you're like me, telling your ankles what to do gets less results than telling your hips what to do and letting your ankles figure it out by themselves.
So here's an exercise you can try at home. Stand to the left side of a door way facing it so that you are centered on the door frame and so you can grab the door frame without leaning forward. Now turn your feet about 65 degrees to the right, then rotate your shoulders back so that they are pointing about 15 degrees to the right (i.e. you've got 40-50 degrees of counter between your feet and your hips/shoulders). Now park your butt over your right foot like we see in pic 3. From there, try to turn your left foot (i.e. your inside ski). You should feel some slight tension below the left knee, more weight on the left heel then on the toes and a pivoty type of turn. Starting from the same position, move your hips forward, especially your left hip forward towards the door jam (you'll need to hold the frame to support yourself). You should now feel more weight just behind the left pinky toe and no tension below the knee. You should also feel a much more powerful and smoother turn of the inside foot. And if you repeat the exercise and focus on the ankle position, you'll notice that your ankles are more open in the first try and more closed in the second try. This is what we feel/do at the next level.
You can get to the hips forward position on skis either via a cross over or a cross under move. For the cross over move, it can help to think of the pole touch as a reach forward and down the hill where the elbow pulls the inside hip during the reach. If you catch your pole touch arm "screen dooring", you're not doing it. On snow, an effective exercise for working on hip and ankle movements is "cowboy turns". Ski with your feet greater than shoulder width apart and make turns. You'll either ski smoothly via hip and ankle movement or you'll jerk wildly as you try to cheat.
Thanks Chris for letting us work you over. Was it as good for you as it was for me?