"The expedition is supposed to be a challenge - not a survival exercise, " he said.

BBC: Charlotte Shaw

The seven teams went through a Subarctic Survival Exercise.

FORBES: Mindfulness as a Tool for Organizational and Social Change

Many prisoners find survival in physical exercise, prayer, or plans for escape.

NEWYORKER: Hellhole

While the results of the breast cancer study backed the idea that exercise can improve survival rates or reduce tumour size, more research was needed in this area, she said.

BBC: NEWS | Health | Housework 'reduces cancer risk'