Camille Herron: American ultrarunner breaks own 100-mile women's world record

Herron broke her own women's world record in winning the USA Track and Field 100 mile Championships.

The 40-year-old beat her previous mark by almost a minute and a half, winning in 12 hours 41 minutes 11 seconds.

The first male athlete, Arlen Glick, came home in 13:10:25.

"What a difference a year makes," said Herron, who was fourth.

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I came back healthy, hungry to redeem myself, and ready to let the magic happen.

She broke the 50-mile world record in her first event as a Masters racer in the 40-44 age group, with a time of 6:08:24.

Herron shattered the old world record by more than an hour in November of last year.