MacMillan believe no-one should face cancer alone and wanted an idea that would promote that ethos. While charity runs are a great way to generate money for a cause, they are also pretty exclusive. Running a marathon isn't easy. That's why we created AdRun. It's a crowd-sourced marathon where each person runs just 126 yards between two outdoor screens, and collectively covering 26.2 miles. Those less inclined to jogging could also sponsor their city.