Switzerland's Marcel Hug, Britain's David Weir and Canada's Brent Lakatos, from left, race down the Mall during the London Marathon in London, England,. Athletes are competing on a 26.2-mile (42.2-kilometer) closed-loop course consisting of 19.6 clockwise laps around St. James' Park. The traditional course along the River Thames was scrapped because of the coronavirus pandemic and only elite men and women are competing and no spectators are permitted