Ultrarunner Karl Meltzer has long dreamed of setting the speed record for crossing America's Appalachian Trail. Now he sets out for his third and final attempt to run the 3,523km (2,188 miles) in less than 46 days, 8 hours, 6 min.
Production companies：
Red Bull Media House
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Interpret Studios
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Overview：Ultrarunner Karl Meltzer has long dreamed of setting the speed record for crossing America's Appalachian Trail. Now he sets out for his third and final attempt to run the 3,523km (2,188 miles) in less than 46 days, 8 hours, 6 min.
