I knew that Thespian honor would come in handy one day.

I took drama classes in high school just for opportunities like this: At http://www.runningamerica08.com/ you can sign up to be in a running movie.
At this very moment, a new movie studio is planning a documentary that will follow two extreme athletes running from San Francisco to New York. They need hundreds of runners for filming which starts June 1.
From the studio's web site, "NEHST is casting 5 people per mile - you can only run one mile with (the runners) officially, but can drop back and continue to run - to run with these athletes to raise money for the charity H2O Africa and witness history being made first hand."
Any runner of any ability can apply.
This also means any "actor" of any ability can apply.
I'm coming for your job, Denzel Washington.