Underround

This looks an absolutely brilliant challenge!!!!

Quote from the Underround site:

"underround^TM is a new anytime running challenge of circa 42kms, visiting 42 London Underground stations totally on foot. The added twist is to go to all of the 42 platforms as well using the stairs or escalators, on the clockwise journey around London’s Famous Streets. The circuit has over 30kms of route between stations and thousands of metres of climb/descent underground that will make this a real ‘Marathon Challenge’ you will want to add to your Running CV. "

Now all I have to do is find a team of people who want to team up with me