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Olympic silver medalist Steve Backley said doing the Olympic Park run was incredible.
Backley, who joined other sports stars including cricketer Alec Stewart and athlete Fatima Whitbread, said:
"It was incredible. It genuinely brought back all the memories of competing at Olympic Games."
Princess Beatrice, who took part in the run, said being among the first to cross the Olympic finish line was an extraordinary moment in what should be "a memorable year for the nation".
Men's winner Tommy Davies said winning the race was fantastic. "This is a once in a lifetime thing," he said.
Five thousand people were the first to cross the finish line at the Olympic Stadium in the 5-mile National Lottery Olympic Park Run - the first public event at the east London stadium.
Men's winner was Tommy Davies, 26, of Loughborough while former model Nell McAndrew, 38, was the women's winner.
Five thousand members of the public took part in the National Lottery Olympic Park Run.
Princess Beatrice officially started the race before taking part in the event herself.
5,000 people run alongside Princess Beatrice and a host of celebrities and athletes in The National Lottery Olympic Park Run.