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James Corden is planning to run from Paris to London to raise money for Sport Relief.
The Gavin And Stacey creator will take on the 280-mile run from the Arc de Triomphe to Marble Arch, to be filmed for Sport Relief 2012, The Sun reports.
James has already started training and injured his knee three weeks ago, but is seeing doctors next week to see if he will need an operation, or if he is fit enough to go ahead with his plans.
The 32-year-old actor and comedian has reportedly been pushed into taking on the mammoth run by comedian John Bishop and is hoping to get the green light so he can show he is up to the challenge.
