How to get ready for cross-country skiing before and during?

Question

I have cross-country skiing coming up, and it may very well be the most demanding sport out there. I want to know supplements or anything that I could use to keep my endurance and energy up, or anything that will help in an physically demanding sport.

Answer 1

http://www.humankinetics.com/products/showproduct.cfm?isbn=0880116528

Answer 2

Look at getting one of the old style Nordic Tracs.. they're cheap and effective for training and building the strength you'll need.