In an effort not to reinvent the wheel, I will direct you to the Livestrong.com website that has a list of activities to get in shape.
Even better, someone made a really great 3 minute video that will give you some great ideas on how to train for the upcoming ski season.
What I would recommend to everyone, even if you only ski a few days each year: take lessons! Even great skiers take lessons — you can always get better. And when you ski better, you have more fun. And won’t get left behind.
Only two more months…