Ben Fogle is taking on his most punishing challenge yet - by swimming across the Atlantic Ocean.
The TV presenter will have to spend up to 12 hours a day in the water, swimming the equivalent of the Channel, to make it in his target of 100 days.
His 3,000-mile journey from the US to Cornwall will dwarf the gruelling achievement of comic David Walliams who swam the Thames last year.
The 38-year-old admitted: "I am daunted by the magnitude of this challenge, but I have never been one to take the easy option."
Ben added: "There is a risk of sharks and icebergs, but this will be about solitude and loneliness.
"I like the ocean, but I like looking at it not looking into it and I think the reality of the task is about dealing with the depths and the unknown on your own."
His previous escapades have included rowing across the Atlantic with friend and Olympic star James Cracknell, as well as racing to the South Pole, which led to him suffering frostbite to his nose.
Father-of-two Ben has also competed in the Marathon Des Sables and has swum from San Francisco to Alcatraz.
He will undergo a tough training schedule over the coming months ready to launch his Atlantic swim in 2013.
Only one other person has completed the ocean swim, and he will be accompanied by a support yacht for sleeping and eating. He will log his starting and stopping points each day to ensure he swims the full distance.
His journey will aid homeless charity Centrepoint, help research for the University of Southampton and work with the World Wide Fund for Nature (WWF) and the Plastic Oceans Foundation to use the trip to highlight the fragile state of the seas.
Further details of the swim can be found at theatlanticswim.com