Emily Cook of the United States practices ahead of the Freestyle Skiing Ladies' Aerials Finals on day seven of the Sochi 2014 Winter Olympics at Rosa Khutor Extreme Park in Sochi, Russia, on February 14, 2014. #

Pilot Beat Hefti and Alex Baumann of Switzerland team 1 in action during the Men's Two-Man Bobsleigh on Day 10 of the Sochi 2014 Winter Olympics at Sliding Center Sanki, on February 17, 2014. #

Poland's Maciej Jodko looks at the foggy slope after the cancellation of the men's snowboard cross competition at the Rosa Khutor Extreme Park, on February 17, 2014. #

From left, second-placed Ireen Wust, first-placed Jorien ter Mors and third-placed Lotte Van Beek, all of the Netherlands, celebrate on the podium during the flower ceremony for the women's 1,500 meter speed skating event at the Adler Arena, on February 16, 2014. #

Sweden's women's 4x5K cross-country relay team (from left) Charlotte Kalla, Anna Haag, Emma Wiken, and Ida Ingemarsdotter, celebrate winning the gold after the women's 4x5K cross-country relay at the 2014 Winter Olympics, on February 15, 2014. #

Kim Alang of South Korea, right, and Cho Ha-ri of South Korea compete in a women's 1500m short track speedskating semifinal at the Iceberg Skating Palace, on February 15, 2014. #

Victor An of Russia, left, and Sjinkie Knegt of Netherlands compete in a men's 1000m short track speedskating quarterfinal at the Iceberg Skating Palace, on February 15, 2014. #

Germany's Eric Frenzel celebrates winning the gold as he is flanked by Japan's silver medal winner Akito Watabe, left, and Norway's bronze medal winner Magnus Krog during the flower ceremony after the cross-country portion of the nordic combined, on February 12, 2014, in Krasnaya Polyana. #

A volunteer enjoys the warming sun beside a banner reading "Sochi 2014 - Hot. Cool. Yours", prior to the women's 10K classical-style cross-country race in Krasnaya Polyana, on February 13, 2014. #

Justyna Kowalczyk of Poland reacts after crossing the finish line during the Ladies' 10km Classic Cross-Country during day six of the Sochi 2014 Winter Olympics, on February 13, 2014. #

Japan's Ayumu Hirano (left), who finished in second place, Switzerland's Iouri Podladtchikov (center), who finished first and Japan's Taku Hiraoka, who placed third, pose after the men's halfpipe snowboarding competition in Rosa Khutor, on February 11, 2014. #

The team from the United States USA-3, Nick Cunningham, second from left, and brakeman Dallas Robinson, far left, greet teammates from USA-3, Nick Cunningham and brakeman Dallas Robinson, as they finish their final run during the men's two-man bobsled competition in Krasnaya Polyana, on February 17, 2014. #

Ted Ligety of the U.S. takes a big jump during the downhill run of the men's alpine skiing super combined training session at the Rosa Khutor Alpine Center, on February 13, 2014. #

Anders Fannemel of Norway lands during the Men's Team Ski Jumping final round on day 10 of the Sochi 2014 Winter Olympics at the RusSki Gorki Ski Jumping Center, on February 17, 2014. #

Jacqueline Hernandez of the U.S. lies on a stretcher after crashing during the women's snowboard cross qualification round in Rosa Khutor, on February 16, 2014. Hernandez, who went out sixth, was the second faller, hitting the slope with a thud as she tried to land backwards and appearing to lose consciousness as the whiplash smashed her head into the snow. Two of the first six riders in Sunday's opening snowboard cross seeding run fell heavily and were taken away on stretchers, a day after Russian freestyle skiier Maria Komissarova was seriously injured on the same course. #

Darya Domracheva of Belarus skis to win a gold medal during the Biathlon Women's 12.5km Mass Start at the Laura Cross-country Ski & Biathlon Center, on February 17, 2014. #

France's Robin Duvillard celebrates with team staff members after the men's cross-country 4 x 10km relay event at the 2014 Sochi Winter Olympics, on February 16, 2014. Sweden finished first ahead of Russia and France. #

Nelli Zhiganshina and Alexander Gazsi of Germany compete in the ice dance short dance figure skating competition at the Iceberg Skating Palace, on February 16, 2014. #

From left: France's Deborah Anthonioz, Faye Gulini of the U.S., Austria's Maria Ramberger, France's Nelly Moenne Loccoz and Eva Samkova of the Czech Republic compete during the women's snowboard cross semi-finals in Rosa Khutor, on February 16, 2014. #

Czech Republic's Eva Samkova, left, celebrates after taking the gold medal in the women's snowboard cross final, ahead of silver medalist Dominique Maltais of Canada, right, at Rosa Khutor Extreme Park, at the 2014 Winter Olympics, on February 16, 2014, in Krasnaya Polyana, Russia. #