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.
More top news
During WW1 leaders started to appreciate the important role of weather. The Somme marks the beginning of military Met Office forecasting.
A daredevil couple from Yeovil have wizzed through the skies in Cornwall as part of their latest fundraising attempt.
Two West Country brewers have merged creating a "force to be reckoned with". St Austell Brewery has bought Bath Ales.