Running in a deep freeze

Jamie will be running across Canada during part of their winter, so will encounter Arctic temperatures he has never experienced before.

We took him to Gloucerstershire University's Sport & Exercise Laboratory where they have a chamber in which the temperature can be lowered to minus 20C.

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Coast to coast Canada run

A British "superhero" adventurer from Gloucester is spending his birthday at the halfway point of a gruelling attempt to become the first person to run across Canada without a support team.