University of Denver nordic ski team does a core training session in the Pat Bowlen Training Center on the DU campus [Getty Images]

DENVER, CO. SEPTEMBER 30: University of Denver nordic ski team does a core training session in the Pat Bowlen Training Center on the DU campus on Tuesday, September 30, 2014. They will open their season in November. They do balance strengthen exercises because during so much of a ski race they are only on one ski and need good lower leg balance. Skiers right to left Christian Shanley, Selma Ahlsand, Dag Frode Trollebø, and Sam Miller. (Denver Post Photo by Cyrus McCrimmon)

Denver Post Cyrus McCrimmon