At 27, Noah Hoffman has had a singular goal — to be one of the best cross-country skiers in the world. From his hometown of Aspen, Colo., to the Sun Valley Ski Education Foundation in 2007, to the U.S. Ski Team (USST) in 2008, Hoffman evolved into the country’s top distance skier. Internationally, Hoffman (who switched clubs in 2009 to join Ski & Snowboard Club Vail) raised expectations after placing second in the 15-kilometer classic at the 2012 U23 World...