Jim Walmsley is one of the best ultrarunners in the world, who a few days ago (12/10/2018), with Tim Freriks and Eric Senseman, set a new FKT on the dramatic and adventurous "R2R2R.alt" in the Grand Canyon.

"It's really aesthetic, because the Bass is the only trail other than the Kaibab that goes completely from one Rim to the other, with the only catch being, there is no bridge across the River..."

Jim describes their preparation, the size and scope of the Grand Canyon, a scouting trip (“we just stood and looked at the River for 30 minutes”), and finally, what it's like to swim across the Colorado River:

"I just took off and swam across … my idea was I wanted to set the tone … we're here to do it, we're not here to chicken out."