Three years ago, the runner DNF'd at mile 67 of the Canyons Endurance Run. Now, at mile 67 of the Grindstone 100, they were determined to finish.

The Grindstone 100 covers 104.7 miles with 19,300 feet of climbing. The runner had trained extensively, including a six-week stint in Colorado for altitude training. Read more travel coverage.

Despite feeling sick and exhausted, the runner relied on Coca-Cola and pretzels for sustenance. With support from their partner, they pushed through to mile 72.3, determined to complete the race. Related: Catamount Falls via Thomas Trail: A Mixed Terrain Run.

This original Runner World brief is based on reporting from The Travel Runner. Visit the source for its complete reporting, context and any later corrections.