David Ridout, a 75-year-old hospital porter at University Hospital Crosshouse, triumphed at the Hyrox World Championships in Chicago.
He won his solo and doubles race, claiming the title of double world champion. David also set a new world record for his age group in the solo race.
Hyrox is a tough sports competition that includes running and functional fitness movements.
The Crosshouse resident qualified for the world championships earlier this year by winning a regional race.
After his big win, David said: “I was absolutely delighted to not only win the two medals, but to break the world record.
“I trained very hard for over a year so I could go out and do my best in Chicago.”
He hopes his victory will be an inspiration to others to improve their health and wellbeing.
He added: “Hopefully by sharing my achievement this may inspire others to look at their options and challenge themselves to improve their health and wellbeing.
“If I can do it, anybody can.”
Helen Gemmell, assistant director of estates and support services, said: “The entire team are extremely proud of him and what he has achieved.”