Nelson runner Tanya McMurtrie is set to compete in the Antarctica marathon in March, using unique training regimes to prepare for the cold temperatures.
Only a few hundred contestants are allowed to compete in the marathon.
"Some people run over that finish line and they go 'I'm never going to do that again.' Well I ran over the finish line and my first thought was 'when am I going to do that again,'" said McMurtrie.
"I want to run a marathon in all seven continents so I have to run on Antarctica to tick off that goal."
McMurtrie will be taking her training inside a cold store facility next year.
"I guess right now it feels quite daunting but that is always the way when you start training for a marathon.
"I try not to let stuff like this freak me out because otherwise you will never finish."