Dry land ski training?

Climb stairs...lots and lots of stairs. They have moving stairs in most gyms, but you can find free ones almost anywhere.

The Alpine Training Center in Boulder, are doing a 8-12 week dry land training cycle, and they post their workouts. Good stuff. thealpinetrainingcenter.com/training

Planks:
hold for 2 minutes --3 times per day

side planks


These will strengthen core and buttocks. Hold for 1-1/2 minutes--3 times a day

Last year I went to PT and my therapist was also a certified ski instructor. He taught me these and it made a huge difference for me, especially going through crud.

I started on October 1 because I l know we're going to have an early season!

Silas, et al,
There is a yoga for skiers class I heard of in the Westlake area of Seattle.
Here's more:
beluminousyoga.com/events/yoga-skiers-olympian-libby-ludlow
ski ya!

I've started too.  I get out the door, usually with two dogs, and walk. 
I have access to some hills.
Some of the time I carry a pack.   
Usually that pack has some barbell plates in it.
Sport specificity + regular training = 
Let it snow

Here's how Bode Miller does it