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For nearly 25 years the Guinness World Record for the women’s 100x1 mile relay has stood at 9:23:39, or 5:37 average mile. On Saturday, June 3, the San Francisco running community is attempting to break that world record, according to the race organizers.

In conjunction with the San Francisco Women’s Miler Club, 100 different women will each run 1 mile on the track at Cox Stadium, an attempt co-hosted by the San Francisco Road Runners, Dolphin South End Runners, Impala Racing Team, Pamakid Runners, and Olympic Club Foundation.

Earlier in May, Guinness World Records decided against allowing pacers for the relay runners, according to race organizers. It is unclear whether the runners who set the record in 1999, coached by Harvey Mitro, had pacers.

Not just anyone can register to run; eligibility requirements stipulate that runners under the age of 50 must be proven sub-6:00 milers, and athletes over the age of 50 must be proven sub-8:00 milers. Plus, all runners must be tied to San Francisco in some way—birth, current or past school attendance, current residence or place of employment, or current membership to a local running club, according to the organizers.

Registration is open until 11:59 p.m. on May 31. Donations are suggested, to support Girls on the Run of the Bay Area.

Headshot of Heather Mayer Irvine
Heather Mayer Irvine
Contributing Writer

Heather is the former food and nutrition editor for Runner’s World, the author of The Runner’s World Vegetarian Cookbook, and a nine-time marathoner with a best of 3:23. She’s also proud of her 19:40 5K and 5:33 mile. Heather is an RRCA certified run coach.