Excellant article BigE. I particularly liked his drawing attention to how the kinetic chain can and does work against us if there are weak links in the chain, or rather if the kinetic chain movement doesn't first start with core stability.
Movement from the center. It is an age old martial arts fundamental, but it is not in opposition from a movement originating at the feet in my opinion. It is the duality of stability and mobility. They are both required, and both work against and for each other. The idea that we can initiate movement and then find core stability is wrong and I think it is what this guy is saying.
Beginers have little stability, but this is one of the things we as instructors can help them find right at the start. They try making the skis move by moving every part, fromn head to toe, instead of stabilizing the core and then moving the right parts to be effective. Skiers at upper levels will tend to equate core stability to controling the direction of the upperbody, which in my opinion is not the same thing.
Core stability is like the foundation of a house. Get the foundation a little off and this weakness or fault will telegraph right on up to the roof. Get the foundation strong, level and square, and you can build anything you want above it. A strong foundation anchors the house, as a strong activarted core anchors our movements in skiing.
Lisamarie spoke of this several years ago. I remember my first tai chi class years ago. The next day my core was somewhat sore. I didn't expect this and it caught me by surprise. It was the simple posture control and core stabilizing required that caused this. The slow dynamic movements of tai chi require a stable core to anchor the movements, and give us a foundation to move from and with. We move our foundation with us in tai chi, just like in skiing, we take it with us, we don't leave it behind expecting it to catch up at some point.
For anyone interested, the two books that I like the most that address this from a western perspective are "Athletic Body in Balance" by Gray Cook, and "ProBodX" by Marv Marinovich & Edythe M. Heus, D.C.
Or take up tai chi from a good instructor. Take a look beneath the surface, beyond the obvious. Later, RicB.