That impressive time unofficially smashed the previous Guinness World Record of 4:26:29, set by Silas Frantz while pushing his son Otto through Arroyo Grande, California, in June 2025. “I truly did not think I was going for the world record,” Biebelhausen told Runner’s World. “[She] squeals when I put the running stroller in and whenever we get to one of our running spots,” he said. If a child is in a secure stroller that’s designed for running, that’s really the key consideration.” When he first looked up the stroller record, he joked that he was surprised someone like Jakob Ingebrigtsen or Josh Kerr hadn’t already taken a stroller out and gone sub-4:00 just because.