bounceswoosh
Ski Diva Extraordinaire
Good point! We can tip our feet to flatten our skis but if our body remains uphill, there will still be some edge left on the snow and the skis won't slide. This usually leads to some upper body rotation to "help" the skis turn. Flattening our skis and moving our weight over the downhill ski both need to happen or we get "stuck" and have to pick up the inside ski or do something else to start the turn. It does not take much edge to preclude the ski from sliding. Once the skis are flat, gravity does the work.
Flattening the skis seems like a very simple concept but can be difficult to do as terrain gets steeper, snow gets bumpier or cruddy.
If I asked 100 students what they would do if the instructor told them to flatten their skis - I'd be surprised if even one of them said to get their CoM down the hill. I am left wondering why instructors ever use the phrase "flatten your skis." But maybe I'm the only one who didn't get the right message out of this instruction?
I'm actually pretty effective at tipping my skis enough to sideslip without using my body - after all, I've been doing it for years - but I'm not sure that's a good thing.