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Multi marathon runner Ben Smith fired the starting gun at the Bournemouth marathon, and then set off to run his 398th marathon in as many days.
He's aiming to set a new world record - by running 401 marathons in 401 days - to raise awaremess of bullying and to raise money for the Kidscape and Stonewall charities.
He told us why he's doing it.
The Bournemouth marathon and half marathon are under way, started by a man who knows more than most about what it takes.
Ben Smith is close to the end of an incredible challenge of running the equivalent of 401 marathons in as many days.
The Bournemouth Marathon will be his 398th marathon.
13 thousand people are taking part in the event, which runs along the seafront between Boscombe and Bournemouth.
For more route details click here