Run a marathon in less than 3 hours

I already ran 40 miles in a single day (see #13). Now I want to run a fast marathon time.

For reference, 3:05 is good enough to qualify for the Boston Marathon in the under 35 age group, so if I meet this goal I'll definitely be registering for that race.

**To run a marathon in under 3 hours, I need to run 6:50 per mile**.

Why is this goal important:
- It's an amazing feat of physical endurance.
- In order to meet the goal, I'll need to make running a daily habit. Which is a Good Thing.
- I bet my younger brother $500 that I could do this by December 8, 2013, at the [California International Marathon](http://www.runcim.org/).