Some people use music or a workout buddy to push them faster. Jonathan Karpoff gets his extra boost from avoiding wild animals. An avid skate skier, Mr. Karpoff frequently goes off the Nordic course and into wilderness areas where he encounters those creatures, plus the occasional coyote. “When you see a young bull moose crashing through some bushes a few yards ahead, it definitely nudges you to ski a little faster,” he says.

Source: Wall Street Journal February 02, 2019 12:00 UTC