Phil Gore, the current backyard ultra world record holder, plans to run 168 hours solo starting August 23. Gore aims to complete 168 loops of a 6.71 km course at Alfred Skeet Reserve in Australia. His current record of 119 laps was set with a competitor.

The backyard ultra format requires runners to complete a loop every hour, with elimination for late arrivals. Gore's solo attempt lacks a competitor to set a final record number. He views the run as a new benchmark for endurance. Read more culture coverage.

Gore's attempt also serves as a fundraiser for Telethon 7, benefiting sick and disadvantaged children. While in-person spots are full, virtual participation is available. The attempt was reported by Max Kagi at Your Local Examiner. Related: Marathons and Half-Marathons Without Lotteries Still Available.

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