Tresco Marathon is already fully booked. The race which rivals the London marathon in May has already booked in 125 runners the maximum it can take.
But people are still queuing up to take part in the challenging sports event and a waiting list has been created.
The race was started up by a chef on Tresco Pete Hingston. He wanted to raise money for research into Cystic Fibrosis.
His daughter suffers from the disease.
In the next few weeks Scilly News will keep you up to date with all the updates on the Tresco Marathon.