Petter Northug (L) of Norway competes to win the men 15km cross country pursuit classic style skiing competition of the FIS World Cup in Kuusamo, Finland on December 2, 2012. Maxim Vylegzhanin (C) of Russia placed second, Kazakhstan's Alexey Poltoranin (R) finished third. AFP PHOTO / MARKKU ULANDER / LEHTIKUVA /
Credit: MARKKU ULANDER
Petter Northug Jr. of Norway, Alexander Legkov of Russia, Martin Johnsrud Sundby of Norway, Chris Andre Jespersen of Norway and Alex Harvey of Canada compete in the Men's 50 km Mass Start Free during day 16 of the Sochi 2014 Winter Olympics at Laura Cross-country Ski & Biathlon Center on February 23, 2014 in Sochi, Russia.
Credit: Alexander Hassenstein
Petter Northug Jr. of Norway crosses the line to claim victory in the Men's Cross Country Individual 15km at the FIS Nordic World Ski Championships on February 27, 2013 in Val di Fiemme, Italy.
Credit: Mike Hewitt
Gold Medallist Petter Northug of Norway stops prior to the line as if to taunt silver medallist Marcus Hellner of Sweden in the Men's Cross Country 4x10km Relay race during the FIS Nordic World Ski Championships at Holmenkollen on March 4, 2011 in Oslo, Norway.
Credit: Christof Koepsel
Petter Northug of Norway celebrates with his 4 gold medals during the FIS Nordic World Ski Championships on March 01, 2015 in Falun, Sweden.
Credit: Trond Tandberg
Petter jr. Northug of Norway takes 1st place during the FIS Cross Country World Cup Men's 15km Mass Start on December 17, 2011 in Rogla, Slovenia.
Credit: Stanko Gruden/Agence Zoom
Marcus Hellner of Sweden leads Simon Oestensen of Norway and Petter Northug of Norway during the 30km men handicap start for the FIS Cross Country World Cup Tour de Ski on January 06, 2010 in Toblach Hochpustertal, Italy.