Around 15,000 people are running the London Marathon for charity on Sunday 21 April. If you're one of those people, help us tell the story of this year’s race. We'd like you to create a 30-second video that shows who you're running for – and why. Share your video using GuardianWitness and we'll publish a shortlist of the best videos on the Guardian's running blog. Olympic rower Zac Purchase will choose the winner, who will receive £100 towards their Marathon fundraising effort.
Closes 10am Friday 26 April 2013.
Make sure you read the terms and conditions before you enter. Entry is acceptance of these terms and conditions.
GuardianWitness is the home of user-generated content on the Guardian. Contribute your video, pictures and stories, and browse news, reviews and creations submitted by others. Posts will be reviewed prior to publication on GuardianWitness, and the best pieces will feature on the Guardian site – they might even appear in the paper.
