This article originally appeared on Competitor.com.
It’s the year of fast stroller running.
The Guinness World Record for fastest half marathon by a female pushing a stroller was broken earlier this month, as 37-year-old Lindsy James of the United Kingdom smashed the previous record—which stood for 15 years.
James’ blistering time of 1:27:34 at the Ramathon in Derby, England broke the previous record—held by American Nancy Schubring since 2001—by more than 3 minutes.
Lindsy ran with her 8 ½-month old son in the stroller, averaging 6:41 per mile the entire way. Her husband, Owen, ran with them (and recorded the entire race on a GoPro, uploading it on YouTube) along with two independent witnesses.
“I lost my mum last year to cancer and I wanted to do something to raise as much money as possible for charity,” Lindsy told the Derby Telegraph. “We wanted to do something fairly high profile and we thought to break a world record would be a huge challenge.”
Lindsy was raising funds for Macmillan Cancer Support.
Her record-setting performance comes just a few months after Calum Neff of Texas broke the men’s record with a 1:11:27 time (5:27 per-mile pace) that won the Katy Half Marathon in February.