There seems to be an annual race called 'race the perimeter' but I wanted to adjust the route so it is more outside of D.C. except when unavoidable. This route therefore uses the Mount Vernon trail and hugs the Potomac from the Virginia side, and only really cuts into D.C. at two unavoidable parts: once to cross the Chain bridge and once to navigate the Anacostia river section with highways. When I did this route, some of the trails after the Chain bridge were really hard to find / lots of fallen trees so I got lost and ended up hugging the highway for more than I would like.