Going Round in Circles - the London Circle Line Challenge. As the name suggests, the aim is to run between every underground station on the Circle Line (the yellow one!) - all 27 of them.
Entrants can take part as a team of two, or individually if they fancy a bigger challenge. The race will start at the Volunteer Pub near Regents Park, where runners will be able to collect their race number and tracker.
You will then set off either on an anticlockwise or clockwise run around the Central Line, collecting a selfie - as proof - at each of the 27 stations!
If you are in a team of two, one runner will go to the Baker Street Tube Station and grab and a daily travel card and travel to your next meeting point on the Circle Line while the other will run to meet you there. It's then time to swap the tracker for the travel card and agree your next meeting point.
The distance between stations varies from 0.2 miles to 1.2 miles. The overall distance to run will be around 16 miles. There are no checkpoints but plenty of shops! If you are injured or had enough then you can grab the tube back to the start.
London, UK, NW1 6XE