Leila, Liina, and Lily Luik are not expected to medal when they compete at the 2016 Olympics in Rio de Janeiro.
But the three Estonian marathon runners will make history as the first set of triplets to compete together.
Kenyan superstar Tiki Gelana set the Olympic record of 2 hours, 23 minutes and 7 seconds in London in 2012. The silver and bronze medal times were 2:23:12 and 2:23:29.
Leila, the oldest of the triplets, has the fastest personal best at 2:37.12, set in Shanghai in 2013. She is followed by Liina, whose personal best is 2 minutes and 30 seconds slower and Lily, the youngest, who is a further 45 seconds back.
Time to get married and pass on the genes
The blond, blued-eyed sisters from the southern Estonian university town of Tartu, now 30 years old, only took up serious distance running when they were 24.