Cheerleader (Felix Jaehn Remix) OMI Download 'Cheerleader (Felix Jaehn Remix)' on iTunes
You can spot a marathon hero from a mile away...
This hilarious ad tries to find the funny side of the agony that thousands will be enduring right now
Runners will be straining every sinew in their quest to complete the 26 miles and 385 yards needed to cross the finish line.
The pain is worth it in the end, with runners having raised over £450 million since 1981.