Razie has asked, “Why do you need to be standing over the center of your feet?” I believe I understand what Jeb is trying to say below, although the language is giving some people fits.
A skier needs to be standing over the center of their feet.
Having a centered stance is really about balance
Our feet are in ski boots, so we want to be standing in balance within the boot. This means that the balance point is in the center of the foot, i. e. under the arch of our foot. However, since our weight is distributed evenly to the ball of our foot, the heel, and the arch as well; the net effect is that we are balancing on a large platform that is the length of our foot and (by extension) the length of the sole of the boot. This is a very stable and neutral platform to balance from.
“Standing over” is an interesting choice of words, but I do not think it is accidental. We are standing over the arch, because our weight is also distributed evenly to the heel and ball of our foot. But the only way we can achieve that balanced distribution is by closing the ankle until we find the feelings of pressure distribution that lead to balance. The ankle and the front of the boot have an important role, in that a particular amount of ankle closure (as supported by the rest of a balanced athletic stance from the ankles up) is the final element that allows the distribution of pressure to occur.
You can’t have this centered stance without being in balance. And being in balance in this way also seems to be neutral, in effect giving you greater freedom of movement.
This will likely be old hat to some, and a new way of thinking about stance and balance for others. For myself, I arrived at this understanding fairly recently. Jeb covered this material during instructor training at the beginning of the season at Cannon. A couple of weeks ago I did a clinic with Donna Kaye Erwin (DK) specifically about this, and pressuring the length of the ski as well (these two are intertwined). I had just read Jeb’s tome, and asked DK (who is the training supervisor for the ski school as well as my seasonal trainer) if what we were drilling was what Jeb was writing about. She confirmed that it was. That clinic was one of the best I have been to, and will be transformative to my skiing. For me, it is a new and better way to balance. But I can share more later on the value within.
I don't claim that what I have shared is infallible knowledge. But I have made an effort to understand it and get it right.