This Sunday, Oct. 1, 2017, photo provided by HOKA One One shows professional trail runner Tim Freriks running to break the single crossing record (rim-to-rim, or R2R) in the Grand Canyon, Arizona. Freriks blazed from the North Rim to the
This Sunday, Oct. 1, 2017, photo provided by HOKA One One shows professional trail runner Tim Freriks running to break the single crossing record (rim-to-rim, or R2R) in the Grand Canyon, Arizona. Freriks blazed from the North Rim to the South Rim at a blistering pace, crossing the 21-mile (34-kilometer) chasm to claim what is called the “fastest known time,” or FKT. There was no prize, only bragging rights to the unofficial record that has become a focus for athletes in all kinds of pursuits on trails, mountains and cliffs. (Sunny Margerum/HOKA One One via AP)