Part One: Calculating the Impossible, 2-Hour Marathon Attempt

CHICAGO (CBS) -- Chicago's running season opens Sunday with the Shamrock Shuffle and unofficially ends in October with the Chicago Marathon.

In between, in Italy, the year's most interesting race will take place. NIKE, three runners from Africa, and a Chicago-area doctor are combining forces to try and run a full marathon in under two hours.

That means they need to go nearly three-minutes faster than anyone has before in an event that usually sees records broken by mere seconds.

RELATED: Part Two: Calculating the Impossible, 2-Hour Marathon Attempt

The runners are the best in the world. The technology is the most advanced yet. The course is specially designed. And the training regimen is cutting edge. WBBM's Rick Gregg has more.

To listen to the entire interview with Dr. Skiba, including more on the record attempt and tips for the everyday runner, click here.