On October 30, 2007 at 8PM PBS will broadcast a NOVA special called Marathon Challenge.

According to their website

it follows 13 generally sedentary people through a training regimen designed to prepare them for an ultimate test of stamina and endurance. Created in cooperation with the Boston Athletic Association®, which granted NOVA unprecedented access to the 111th Boston Marathon®, and Tufts University, “Marathon Challenge” takes viewers on a unique adventure inside the human body, tracking the physiological changes that exercise can bring about.

The Marathon Challenge site offers team biographies, journal entries from the participants, a complete training schedule, expert advice, and much more.

Check your local listings to make sure the date and time are correct.