Amazing how these guys push themselves. Here's a couple of articles that exemplify just how hard they are going:
http://www.newsinenglish.no/2011/02/28/exhausted-bj%C3%B8rgen-mines-third-gold/
http://www.newsinenglish.no/2011/02/28/northug-drops-next-competition/
Alta Backcountry 