Replying to Workouts aimed at skiers

Right, so I've decided to start hitting the gym after my exams are done instead of just doing a bit of jogging every once in a while, and I was basically wondering if you guys could give some advice when it comes to particular workouts and excercises that are helpful for skiers. Any stomach/chest excercises are welcome as well though... so not just knee/leg related stuff.

Please provide a brief description as well as I'm not really familiar with any names of gym equipment or excercises if that's not too much of a hassle.

And yes, I have seen the Sammy K. video