A runner from Sussex is in preparation to try to fulfil a lifetime's ambition of running the North Pole.
The North Pole challenge will be Kate Charles' toughest yet
Kate Charles, from Brighton, has been training in a freezer in order to ensure her body gets acclimatised to the conditions.
She completed her first marathon, in Kenya in June 2002, and since then has run in Chile, Norway, the US, Australia, Thailand and Antarctica.
She is due to compete in the North Pole marathon on 8 April.
She is running the marathon in aid of Demelza House, a residential children's hospice based near Sittingbourne, in Kent.
Her preparation has included running in the ice and snow of Switzerland, and training in the gym and with the army.
She has also been training in the sports science department at the University of Brighton, where she has been running inside a giant freezer at temperatures of -10C.
Her progress is being monitored by students, who are assessing her level of fitness and helping her to prepare for the unpredictability of her gruelling challenge.