“Mind Over Matter” is a book by Sir Ranulph Fiennes detailing his 1992-1993 unsupported crossing of Antarctica with Dr. Michael Stroud. The epic 1,350-mile journey, which set a world record for the longest unsupported polar journey, was a grueling ordeal that tested the explorers physically and mentally, leading to severe injuries, equipment failures, and a near-fatal experience. The expedition, intended to raise money for multiple sclerosis research, ultimately pushed both men to their limits. 

In November 1992, Sir Ranulph Fiennes and Dr. Michael Stroud began the first unsupported crossing of the Antarctic continent, walking and skiing across the ice in temperatures as low as -86∘F (-66∘C).

They battled extreme conditions, including blizzard winds, and dealt with severe injuries like a deep foot infection for Fiennes and the near-fatal crevasse fall for Stroud. They also suffered from starvation and hypothermia.

The immense physical toll created significant mental strain, causing their friendship to deteriorate into antagonism.

The 95-day journey ended when they were airlifted out, having completed the longest unsupported polar journey in history.