SkiDude72, I think I understand your concerns, and while I agree that a recreational skier will give her- or himself the best advantage by taking lessons from a qualified professional who presumably would introduce him or her to many of these exercises in the course of the instruction, that's not happening with great regularity in the real world. Industry surveys show that the least popular product ski schools offer is the advanced lesson. I don't know why, but I suspect it has to do with the perception that lessons aren't worth their time or money. Some instructors have found that writing a book for popular consumption is a way to market advanced lessons, as readers find that reading about how skiing better leads to a desire for coaching from the author or the author's understudies. I'm stealing a page from their book, you might say.
The dangers of misunderstanding what is required of an exercise could be mediated by providing accurate models -- video models for each exercise would be ideal.
Rusty, the exercise caveat usually is to consult a medical doctor to see if you are fit enough for vigorous exercise. Same as the Viagra ads. I have never seen one that told me to consult a certified fitness pro before embarking on the program. But these fitness regimens are on dvd, so you are "with" the exercise pro who put the program together, though certainly no one is watching to see if I am doing it with proper form. I am told to check my reflection in the TV and compare it to the others doing the exercises.
Well that certainly isnt the case in places like Whistler. The advanced lesson programs are abundant, and booming. Two Alpine Pods, stacked with full time pros, numerous GAP programs, Xtremely Canadian, Dave Murray Camps, Ski Esprit, Level 1 program, etc etc.