He is running as part of the Mr Men and Little Miss team and is aiming to raise £4,000 with £2,300 already raised by his school.
To make a donation to support Mr Clark, go to www.virginmoneygiving.com/russellclark
Mr Clark was pictured on the front of the Stowmarket edition of yesterday's Bury Free Press.
- Are you running the London Marathon? Let us know at firstname.lastname@example.org