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Meet the new star at United

He may not have got the world in motion, but Smithy is keeping Manchester United on their toes.

Actor James Corden -- famed for bursting into the rap from New Order's World In Motion in TV hit Gavin And Stacey -- was putting players through their paces by leading an aerobics class.

The tubby star filmed the sketch with stars such as Wayne Rooney and Rio Ferdinand, to be aired on March 19, for this year's BBC Sport Relief spectacular.

He puts aside his loyalty to West Ham to take charge of the Man U squad, giving players a training session they will never forget.