I just got home from watching Spirit of the Marathon. It is a documentary that follows elite athletes Daniel Njenga and Deena Kastor along with a handful of middle to back of the packers. It is centered around the 2005 Chicago Marathon. It starts 4 months out and chronicles the athletes as they prepare for the race. There are many interview scenes with Marathon greats which keep the flow of the movie going.
I enjoyed the movie and would recommend it to anyone who enjoys running. It really portrays the triumph of the human spirit. It is worth the rental fee when it comes out on DVD.