My altimeter watch read 8,200 feet above sea level. The slope below dropped off like a cliff. At the height of a mountain pass I gazed out and thought, “This could be the most intense footrace I’ve ever run.”
The setting was the Pyrenees Mountains in southern France, where last week I traveled to play witness to a growing running movement taking Europe and parts of North America by storm.

Long-distance trail running — often called ultra running — is not a new trend, though in recent years it’s become bigger and more visible on the radar of the average outdoor athlete.
Any footrace on a trail that’s longer than a marathon distance can qualify as an ultra. These races often feature courses between 31 miles (50 kilometers) and 100 miles in length, mixing a wilderness adventure with a pure athletic feat few people would ever try.

But the numbers are growing. In France, the Kilian’s Classik race I ran attracted hundreds of area runners. Its 45-kilometer course climbed through pine forests then shot up to ascend multiple Pyrenean peaks.
I laced my shoes tight the morning of the race and strapped a hydration pack on my back. I stashed away several pieces of energy food. It was going to be a long day.



