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A 48-year-old just broke the speed record for the Appalachian Trail

Karl Meltzer, a professional ultrarunner, has completed the Appalachian Trail in record time at the age of 48. What might take the average hiker up to 6 months to complete, Meltzer completed in 45 days, 22 hours, and 38 minutes. Here is how he did it. 

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