Updated: Mikaela Shiffrin challenging her comfort zone

Mikaela Shiffrin earned 21 World Cup victories, two world championship titles, an Olympic gold medal and a pair of reindeer — that’s right, reindeer — by racing within her comfort zone. Next for the 21-year-old skier: raising her speed limit. She’s working with a new coach — Mike Day, the former giant slalom mentor of […]