Justin Freeman is a US Olympian in cross-country skiing. He races for the Saab Salomon Factory Team – http://www.skipost.com Levels One and Two Skiers talk a lot about training levels, usually numbering them one through five, but, if my experience over the past decade and a half is any indication, truly understanding when and how to use the various levels is rare. This is the first in a three-part article about proper use of the...