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Running around the world: 'It's been a fantastic adventure'

Dr Doug Richards is one of the few people in the world to run a half marathon - or further - on all 7 continents before his 70th birthday.

And later this month he's going to reach a huge milestone, he will have run a total distance of 24,902 miles - which is the equivalent of running all the way around the world!

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Duration:

5 minutes