I spent four days last week at the London Marathon Expo, drawing on mirrors on the New Balance stand.

Masterminded by the dudes at Creative Spark, the idea was to get expo-goers to interact with the illustrations, taking photos to post to Twitter/Instagram, using the #UseYourRun hashtag, while upstairs people were encouraged to run a lap of the New Balance track. For each lap run, New Balance would donate £2 to Good Gym. Nice!

Last 4 pics courtesy of @andy_wingate, @PRING.co.uk, @Wadsy_82 and @Chaubear612