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Updated February 8, 2013, 12:10 p.m. ET Betting Big on Nitrogen U.S. Ski Team Pins Hopes for Sochi on Science By MATTHEW FUTTERMAN Reuters Ted Ligety, above, Sarah Hendrickson and Mikaela Shiffrin are strong medal contenders for the U.S. at the Sochi Games. Park City, Utah Most People who saw the footage of American all-everything skier Lindsey Vonn somersaulting over the snow on an Austrian mountain this week, shredding her knee ligaments and breaking her tibia in the process, figured…

Read original article here: http://online.wsj.com/article/SB10001424052702304746604577384021387990452.html Killer Pull-Ups, Brutal Sprints and a Nap for a Ski Champ By MATTHEW FUTTERMAN  Mark Meyer for The Wall Street Journal During her off-season, Kikkan Randall will run for 90 to 150 minutes on the rolling trails at what she calls a ‘conversational pace’ of eight-minute miles. For Kikkan Randall, a cross-country skiing world champion, working out in the off-season is about far more than sliding across the snow. Ms. Randall spends spring and summer…