King converts barn for his latest innovation: Altitude training

KASILOF, Alaska — Jeff King’s dogs nap on simulated mountaintops and run through real valleys - a one-two combination that experts who train Olympic athletes, Tour de France cyclists and the NFL’s Chicago Bears advise for peak fitness.

Many athletes have turned to altitude chambers - hoping to boost endurance, strength and speed - for more than a decade. But who would have thought the technique would show up in Alaska to condition sled dogs? Who else: Jeff King, winner of the 2006 Iditarod Trail Sled Dog Race and renowned tinkerer.
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