I realize that this is old news, but I just got around to watching the NOVA marathon documentary. I had the day off and I'm a running geek. So, this is how I spend my day off... trolling for running stuff. It was parallel to my journey to the MCM this year and I really enjoyed it. It took 13 sedentary people and trained them for 9 months to run the Boston Marathon. It tracked their progress and really showed some of the challenges of marathon running. But, it also showed that it can be done and you don't have to be superhuman. That's what I did with my day off. If you are interested.... They have it in five chapters on their website and it takes about 50 minutes to watch.
Here's the link.