A little more than four years ago, a group of women clad in all black race suits and bib 3 huddled in an athlete warming room. The muffled voice of an announcer speaking in Swedish could be heard broadcasting outside, an English translation relaying the same message: 10 minutes to start. The quartet departed the building, four blondes — one highlighted pink — headed for the start gate. A pass through a patch of sunlight revealed a second...