I go twice a week. After a warm-up of benching 3*12 of 4 plates, I work
on lats, tris, and abs, which are all important for skiing. I also do
lunges, which work out your butt and quads, and (I think) are good for
skiing.

Don't forget the beach muscles tho' (pecs, bis, etc.). That's really
the only reason to go to the gym.

bt