But on November 7, she will undertake an even bigger challenge, running the 213-kilometre Manaslu Mountain trail in Nepal.

Not satisfied just to challenge herself physically, emotionally and mentally, Shadbolt is also trying to raise $2000 for SisuGirls and Girls Running Fund - Trail Running Nepal.

SisuGirls is a charity that aims to inspire girls all over the world to challenge themselves through sport and adventure.

Shadbolt said recently the Girls Running Fund had helped 23-year-old Nepalese girl Mira compete in Italy, where she won two international running events.

It was Mira's first time outside of Nepal.

"She wouldn't be able to afford an education in Kathmandu, or run a race without the help of Trail Running Nepal," Shadbolt said.

"(This charity) really rings true to me because sport and adventure have been one of the biggest influences in my life and given me so many opportunities to do really good things."

Starting on the plains at 500 metres above sea level, the runners will climb to a maximum altitude of 5100 metres, running on average 30 kilometres a day, most at high altitude.

Having been to the area before to trek and mountaineer, Shadbolt knows exactly what she has gotten herself into, but that doesn't make it any easier.

"I've been to the Everest region a couple of times and this is closer to the Annapurna region, where I have been a couple of times as well," she said.

"But the idea of acclimatising at altitude is that you take it easy, don't push yourself too hard and don't go too high too fast, but when you are running that all goes out the window.

"They do try to keep us under 4000 metres for the first few nights, which is good, but it is still not enough time for us to properly acclimatise for when we go over the high passes."

Shadbolt explained that doing anything at altitude was made harder by the lack of oxygen.

She said even packing your sleeping bag and tying your shoes could leave you feeling puffed and exhausted.

As well as the altitude, getting sick from the food, water and questionable hygiene in the remote mountain region were her greatest concerns.

Despite this she laughed nonchalantly and said it would all be OK because she had helicopter insurance in case she needed to be evacuated out for any reason.

To further add to the challenge, each runner will be required to carry a five-kilogram pack containing food and water, as well as cold weather gear.

A porter will carry the rest of their gear and meet up with them at the allocated overnight camp.

"Each night we will stay in a village and the porters will arrive at some point after the runners so it will be pretty cold by the time they get there," she said.

"That's why we have to carry the gear."

Some nights the runners will sleep in tents, but mostly they will be sleeping in a village tea house.

"One way of making the run more popular with the local people was to partner with a project that provides solar energy and hydro power, so some of the money we pay for the run goes towards that.

"The area we run through is very remote and there are not a lot of climbers or trekkers through there so there isn't a lot of infrastructure," Shadbolt explained.

"A lot of the villages we run through have received lights and power through those projects."

Each morning the runners will be up about 6am and will head off as soon as possible after that.

This means that if a runner comes in late on one particular leg of the trail, they may only get a few hours sleep before having to head off again.

"It's a bit unknown as to how long it will take to run," she said.

"I have been reading a lot of the blogs online from previous runners and they have been freaking me out because people talk about finishing stages at 2.30am!

"I am hoping I won't be that slow.

"It will be an awful cycle if that happens."

Luckily a rest day is factored into the ultra-mega marathon.

So why would someone put themselves through such a gruelling challenge?

"I am very aware that there are so many people around the world, girls in particular, who don't get that opportunity and if I can do something to help more people do that then I will," Shadbolt said.

"I also like to remind myself every now and then to not get comfortable in the life that we have here, remember what else is going on, look at the bigger picture.

"Besides, I just love mountains!"

To help Shadbolt reach her $2000 target go to, www.indiegogo.com/projects/running-213-kms-across-the-himalaya