Could you run a marathon? How about doing it in temperatures as low as -50 degrees?
That is exactly what fifty athletes from around the world have done in Antarctica.
The athletes were kitted out in balaclavas, goggles, gloves and mittens to protect them against the freezing cold and allow them to run the 42 kilometre course.
An earlier marathon saw six runners run a hundred kilometres non-stop!
Article written by Charlotte