5 marathons in 5 days: Dom Harvey completes challenge, raises life-saving funds for 3yo girl

The Edge host Dom Harvey has completed five marathons in five days - a challenge he set for himself in order to raise life-saving funds for a little girl's cancer treatment.

"It's amazing what the human body can handle if you're doing it for the right reasons," Harvey said in his final video diary after crossing the finish line on Friday afternoon.

The broadcaster ran 201km over five consecutive days, and at the time of writing, has raised over $200,000 for three-year-old Ka'iulani Forbes and her family.

Dom, Meg and Randell from The Edge met Ka'iulani last month, who suffers from a rare form of cancer called Neuroblastoma which doesn't respond to chemotherapy.

The breakfast hosts heard how parents Moana and Manihira Forbes were urgently trying to raise the more than $260,000 necessary to access life-saving treatment overseas - even  selling their house.

Harvey then vowed to undertake the mammoth marathon effort, and donations began to pour in to Ka'iulani's GiveALittle page.

"If I wasn't doing it for Lani and the Forbes family, I don't think I would have had the motivation or the desire to go through with that," he said today.

"It's been so uplifting, hearing what it means to the family and just seeing the outpouring of support from Edge listeners on the GiveALittle page. "

In addition to some 4100 online donations, this morning ANZ pledged $50,000 to the cause on Daffodil Day. The news of the extra funds brought Ka'iulani's mother to tears.

Harvey called the past week "the toughest thing he's ever done", both mentally and physically.

Having finally made it to the finish line, the broadcaster said he planned to "go home, have some wine, have a spa and then probably sleep for days".

The Edge expects further funds to roll in over the coming days, as money is collected from school mufti days nation-wide and online auctions.