Commonwealth Games swimmers Gemma Kane (Bangor Swimming Club), Conor Munn (Ards Swimming Club) and Danielle Hill (Larne Swimming Club) teamed up at Bangor's Aurora Aquatic and Leisure Centre to encourage young people to dive in to the Forest Feast AquaSprint Junior Swimming League.
The event will see 1,500 young swimmers from 25 clubs across Ulster compete in four divisions, leading up to a grand finale in June 2015.
Conor, Danielle and Gemma progressed to this year's Commonwealth Games in Glasgow, having previously competed in the Junior Swimming League.
Forest Feast marketing manager Deirdre Burns said: "This is the fifth year running that Forest Feast has been proud sponsor of the AquaSprint Junior Swimming League.
"Grassroots sporting initiatives such as AquaSprint not only bring young people together to be active and compete in a fun, social environment, but also help identify and inspire some of Northern Ireland's most promising future sporting talent. The fantastic Commonwealth athletes who have helped us launch this year's league will no doubt be great inspiration to young AquaSprint swimmers.
"The benefits of being part of a fun, team-based sport at a young age are tangible - growing confidence, encouraging friendships and underlining the importance of activity."
Swim Ulster's Ruth McQuillan added: "We would like to thank Forest Feast for their continued support of the Aquasprint Junior Swimming League, which is a very popular competition.
"Aquasprint is an introduction to competitive swimming and many of our elite swimmers who compete at the Commonwealth Games, European Championships and indeed Olympics started their road to success in this league.
"Having Forest Feast on board gives us the opportunity to encourage these young athletes to choose nutritious snacking options - an essential part of every athlete's lifestyle."