Team GB’s Kelly Large joined competitors from across the county to take part in the Luton aquathlon on Sunday morning.
The GB athlete was the first female and Adam Gibson won the race, part of the Hercules events.
Athletes started with a 400m swim at Inspire: Luton Sports Village, followed by a 5km run.
Gifty Enright, director of Hercules events, said: “The multi sport series we have been running with Active Luton have been a great success. We have had fantastic line ups of competitors from elite triathletes to complete novices.
“We can’t wait for the next two events on the 11 May and 1 June, which are sure to be just as exciting.
“Hercules Events’ goal is to develop multi-sports at grass roots level in Luton and to make it accessible for everyone.
“The Partnership with Active Luton, using both their stunning Inspire Sports Village site and the newly refurbished Lewsey Sports Park sites helps to further this goal.
“We are very grateful to the Luton Air Cadets and their officer, Amanda Burnham, who have turned out in full uniform to marshal the events.”
The first Hercules event was a duathlon, run, bike, run race, at Lewsey Sports Park on mothers day, Andy Chatterton won the event and Dionne Thurland was the first female.
Stuart Trower, group operations manager at Active Luton, said: “Whether a novice or experienced multi sport participant, the inaugural series of events has provided an opportunity for the local community and others to challenge themselves.
“Located at fantastic facilities which take place in a back drop of beautiful surroundings, these events offer an opportunity for personal achievement, attainable by all with the will to achieve.”
The Hercules events will continue throughout the summer.