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Crawford became a regular marathoner and competitive orienteer.

Using a compass, snowshoes and his background as a cartographer and competitive orienteer, the 61-year-old British artist and a handful of volunteers recently tromped across a frozen reservoir near the ski resort town of Silverthorne, west of Denver, to create a massive, geometrical design on a fresh canvas of snow.

“It is just this automatic part of his mind,” said Gueorgiou’s girlfriend, Annika Billstam, who is a top orienteer as well.

Students who had balked at conventional fitness programs poured into the forests to race from checkpoint to checkpoint, studying maps, steadying compasses and racing against the orienteer's chief adversary, the clock.

The trick," says a top American orienteer, Peter Gagarin, "is to balance between speed and accuracy.