Competitor flies during the Red Bull X-Alps at Matterhorn in Zermatt, Switzerland on July 12th, 2013. Photo: Felix Wolk/ Red Bull Content Pool.

Logging some sky time during the 2013 Red Bull X-Alps at the Matterhorn in Zermatt, Switzerland. Photo: Felix Wolk/Red Bull Content Pool

On July 5, most of us are going to be nursing some serious hamburger hangovers from our Independence Day festivities.

Unless, of course, you happen to one of the four U.S. athletes embarking on one of the toughest adventure races in the world, running and paragliding across six countries, 645 miles and Europe's tallest mountains.

Clement Latour of France (FRA1) arrives at the eights day of the Red Bull X-Alps 2013 at the turnpoint St Hilaire in France on July 14 2013. Photo: Sebastian Marko/Red Bull Content Pool.

Clement Latour of France arrives at the turn point of St. Hilaire in his home country at X-Alps 2013. Photo: Sebastian Marko/Red Bull Content Pool

The seventh edition of the Red Bull X-Alps pits 33 competitors from around the world against each other for a multi-day race across Europe, from the historic city of Salzburg, Austria, to the Mediterranean Sea of Monaco. Athletes must hike or fly 645 miles across the Alps in the fastest time possible (to date, the record of six days, 23 hours and 40 minutes was set in 2013). The seven countries sending athletes to make the traverse are Austria, Germany, Italy, Switzerland, France, Monaco and the United States.

Competitor flies during the Red Bull X-Alps 2013 at Mont Blanc in Chamonix, France on July 14th, 2013. Photo: Felix Wölk / Red Bull Content Pool.

Afoot or in flight, you gotta cover that 645 somehow. Photo: Felix Wölk/Red Bull Content Pool

On Team USA? National Geographic Adventurer of the Year Gavin McClurg, 43, a meteorologist and four-time X-Alps vet who always trains with his young son on his back, as well as Honza Rejmanek, 40, a paragliding instructor; 50-time El Capitan climber Dave Turner, 33; and Dawn Westrum, 37, a former U.S. soldier and the second woman ever to compete in X-Alps.

Live tracking of the race starts July 2 with a one-day prologue at redbullxalps.com.

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