BBC Hereford & Worcester's Tim Boswell says it is "a huge relief" after his record was verified.
Thousands of runners are expected to take part, with a number of roads expected to be closed.
Olly Brown says he has raised almost £90,000 for the charity.
The 13.1 mile race started and finished in Ormeau Park as thousands of runners took in the city.
Tim Boswell broadcasted live as he ran the Worcester Half Marathon in a challenge set by Steve Cram.
About 2,000 people are expected to take part in the event on Sunday.
Sarah Groves finds that 46 people were "crazy" enough to take on the challenge.
The BBC is planning to set the record for fastest half marathon while presenting a live radio show.
Runners and wheelchair users are taking to Tyneside next Sunday in the event's 45th year.
