Fatboy became fast boy when Norman Cook pulled on his running shoes to take part in a road race.
The DJ and producer, who lives in Hove, took part in the 10km race along Brighton seafront yesterday.
He joined about 1,800 other fun-runners in the event to raise money for the Pink Dolphin Appeal for a new breast cancer unit at the Royal Sussex County Hospital and Brighton and Hove City Athletics Club.
Norman, wearing an acid house T-shirt, ran with the throng from Madeira Drive to Black Rock, then to the King Alfred Leisure Centre and back to the Palace Pier.
The front runners finished in about half an hour, while Norman crossed the line after 54 minutes.
The event was organised by Brighton and Hove Rotarians and the athletics club.
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