We can't correct excessive bend at the waist without increasing knee and/or ankle flex.
I respectfully disagree with this blanket statement. First we can fix the fore/aft plane alignment issues if they are the cause (no sense in trying to change someone's stance if the equipment is determining where they must stand to find equilibrium). Second, if the equipment alignment is not a factor and the boot cuff neutral lower leg angle is good for the skier, flexing the ankles more is not necessarily going to achieve the desired "hips over the feet" goal. The concept of keeping the hips over the feet is a dynamic movement throughout the turns rather than a static position. When discussing a position or neutral stance I am referring to a position passed through when skis are flat on snow. This position (of open hip joint) is passed through in a flexion/extension type turn where we are extending to change edges, rather than the retraction end of the spectrum, where we are flexing as we change edges, However; the goal is the same, to keep the hips moving forward over the feet.
I spent three days last week skiing with 5 different members of the PSIA Alpine team and all were focused on this topic of keeping the hips over the feet
through the turn as opposed to: allowing the hips to drop back and in, extending vertically, stalling during turn completion. While I agree with HDN above that moving the feet forward or aft using the ankle will have substantial affect on the cg location, and is certainly one way of re-centering after edge change, the concept of keeping the hips moving down the hill all the time is a difficult concept to explain and relay. One can extend the hips forward or think of pulling the feet back during extension, either can get the hips over the feet. In either case the goal should be to extend the legs with hips over the feet by the apex of the turns. Also, understand while we are inclined and angulated to the inside of the arc to balance against the centrifugal force, the hips should still be over the feet in that balance axis.
I was able to make a slight adjustment to my stance over these three days that amounted to just an inch or so. I would find it difficult to explain here without being able to demonstrate, but in essence the mind set of keeping the skis turning through the completion of the arc as you simultaneously reduce the edge angle toward the edge change while moving the hips forward is the sensation we should experience. Most skiers keep moving inside until they decide to change edges and as they release their edge hold they release the turn immediately. If we think about holding that anticipation tension just a bit longer during the edge release/change and move the hips forward and across before releasing the muscle tension we allow the hips to continue moving forward over the feet.
I really don't believe this concept requires thought about flexing the ankles.Edited by bud heishman - 1/14/10 at 2:37pm