Up to 10,000 people are expected to come out and watch a major international triathlon being held in central Dublin this weekend.
The Ironman 70.3 is a race, involving a swim, cycle and run on Sunday morning.
2, 500 athletes from Ireland and all over the world will take part.
Starting in Dun Laoghaire, the triathlon begins with a 2 kilometre swim, followed by a 90k cycle into the city centre and out as far as Kilcock in Co Kildare, and a 21 kilometre run in the Phoenix Park.
Race Director, John Walnutt, says it's the first time an Ironman race has come to Dublin.
