An Alaskan athlete’s 65K roundtrip run in the Grand Canyon

Lars Arneson set the fastest known time on a 40-mile route from one side of the Grand Canyon to the other and then back again

Video: Jim Walmsley’s crazy, breathtaking Grand Canyon record run

Some are calling this one of the great running performances of all-time. One thing is for sure after watching this video, the R2R2R is one crazy run.