Jessie Diggins recently graduated from Stillwater High School in Minnesota, where she earned three individual state championship titles, among other impressive national and international results. Diggins skis for CXC Team Vertical Limit. One might wonder why an endurance athlete like a skier or runner would ever bother lifting weights. Isn’t specific strength enough? Shouldn’t skating without poles, single-sticking and double-poling build all the muscles a skier would need? The truth is, general strength does more...