London CNN  —  The journey to the London City Runners clubhouse is a test of willpower in many ways. If the thought of a 10-kilometer (6.2-mile) run isn’t enough to put you off, its location on the famous Bermondsey Beer Mile, with the aromas of bakeries and microbreweries spilling onto the street, may entice you. But something else is brewing for those with the fortitude to continue. Despite the clubhouse’s declared focus on running with its walls adorned with pictures and medals from races