LAKE PLACID, N.Y. – Flinging around a sharp corner about a ski length behind one another, Sophie Caldwell (Stratton Mountain School T2 Team), Ida Sargent (Craftsbury Green Racing Project), Caitlin Patterson (CGRP) and Jessie Diggins (SMS) each lowered into a tuck and prepared for a long, steep descent. Diggins called out to the others just ahead of her in the classic rollerski sprint at Lake Placid’s Olympic Jumping Complex. “That’s it,” the U.S. Ski Team...