A time-lapse video of the 2012 San Francisco Marathon as it ran through the Mission somewhere between miles 20 and 21. Thousands of people sprinted, jogged, shuffled, and walked down Guerrero St over the course of 4 hours. The video above starts with the first runner, Nathan Krah, who went on to win the entire race with a average mile of 5:36. A few more people trickle in behind him, but it’s not for awhile until you start seeing the crowds. At one point the course was diverted to a different street periodically in order to thin the crowds a bit, which is why you’ll see pulsing waves of people. Heather and I woke up early not only to catch this video, but also to cheer on our friend, Eric Bond, who ran all 26.2 miles at a still impressive 10:32 minute mile.