Harvey Sweetland Lewis is making his way across the Appalachian Trail in hopes of setting a new FKT of 45 days and a few hours.
Will the Appalachian Trail record be Jurek's last great feat?
The ultrarunner reached the summit of Mt. Katahdin in Maine on Sunday.
Jurek started his journey on May 27 in Georgia.
They've made their name in ultras, but they're leaving the trails behind for one day in Boston.