Tdk just go straight on a flat trail and tip your foot towards little toe. While it's on the ground. If you allow your body to go you will start turing that direction. You can prevent it, but don't. Then play with both feet on ground but mainly supported by one. Pretty wide stance. Tip one foot towards little toe then back to bjg toe and continue. You'll roll the ski from outside edge to inside edge. Nice warmup for feet/ ankles.
Tipping the foot changes where the balance lines are in the foot and how the foot is loaded. If you lock that out it greatly affects balance. I tried once having a rigid footbed made. Had fiberglass in the arch. Oh, one day on that my knees hurt for over a week.
I suspect a fair number of junior racers have locked up their ceet by overly constrictive boots. Essentially they are skiing with club feet. Like pieces of wood. That is not good.
If the ankle bones are in contact with the shell so you cannot tip the ankle at all you will have a very poor balance. - Jamt
If you only get one thing out of this thread, get that. And locking up the feet, or having them numb, is bad.