The marathon was recommended to Ms Wearne and she managed to get one of the 200 spots in the run. It takes place on an ice cap and Ms Wearne will tour the course the day before the marathon.
"That's probably going to be reasonably frightening because it's probably going to be diabolical. It's all snow and ice, then you run out on the ice cap. It's 6km to 8km on the ice cap. That's why they advise you to wear crampons. There's a section where it's kind of tussock with snow."
While it was called a marathon, it was more of an endurance event.
"It's in a part of the world that's always changing. There's wildlife. We get to see the aurora lights. It's a place in the world you would never normally get to see.
"I like peace and quiet really, that's what appeals to me about this. There's only about 200 people taking part, that's quite a contrast to the New York Marathon with thousands of people."
Although she does not particularly enjoy running on the road, Ms Wearne took part in the New York City Marathon in 2011 for the experience.
"I like trail running. You see the world in a different way when you run like that. Often for these events they open up pieces of land that you would normally never go to."
She decided to run for Arthritis New Zealand to give something back to other people with arthritis.
"I'm now having a good experience and feel like I've got off quite lightly. A lot of people don't do as well. Arthritis New Zealand are a great institution to be involved in."