With the ascent comes the end. On Sunday the 2018/2019 Tour de Ski (TdS) Stage 7 9-kilometer skate pursuit brought the Tour de Ski to a close atop Val di Fiemme’s Alpe Cermis. The basic Alpe Cermis stats are stout: the slope approaches a 30 percent grade in sections, and averages 12 percent, and climbs 420 meters in 3.5 k. It’s a lung-buster. After the 60.67 k seven-stage Tour that began on Dec. 29...