The 26.4 mile route has made no concessions to sense or physical exertion, 100% committed as it is to the shape of a cock and balls on the London map and the inclusion of as much penis punnery as possible.
To ensure the sack race maximises awareness raising, a specially designed sack will be deployed. You can probably guess what shape that's coming in.
Organiser Phil Ball enlarges,
It might seem a bit childish to be hopping around London in a giant ball-bag, but it is going to be really physically and mentally demanding. Think how hard the sack race was at your school sports day, then imagine doing it for a whole mile while facing the ridicule of complete strangers. In an event such as this, you need to have great physical stamina and not mind looking, quite literally, like a giant dick.
We warmly recommend the intrepid phallic fundraisers reward themselves with a circuit of the Rude and Lewd Pub Crawl after.