Thousands of runners will descend on Harpenden today for the Herts 10K.
The event will take place in Rothamsted Park.
Entertainment, including a bouncy castle and jousting competitions, will be on offer for spectators throughout the day.
The race will begin at 10am. The event is the single biggest fundraising event for Grove House Hospice and has raised more than £1 million since it started in 2006.
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