She won the first Olympic gold marathon medal in 1984.
It's a driving force behind the second "running boom".
The important milestone will be commemorated this year at the race's start.
The previous record was set in 1984.
They have been seen running in pink Five Fingers.
Her mantra was "relentless, forward, progress".
It's been 50 years since that groundbreaking moment.
One runner compares turning 40 to hitting the proverbial wall in the 26.2-mile race.
She is a history-making runner, women's running advocate, commentator, and author.
The Women's Running Magazine Women's Half Marathon Series is the nation's largest women's half-marathon series