Dr. Michael Joyner, a physiologist & expert in human performance at the Mayo Clinic, once published a paper noting that might be physiologically possible for an ideal human runner to run a marathon in under two hours and possibly 1:58.

He's been getting calls all week about the sub-two hour marathon attempt that will be staged by Nike but we were able to catch him in between clinical work to pick his brain about the attempt.

Joyner gives the Nike attempt a 10% to 15% chance of breaking two hours and he explains why.

It's just a little short episode to wet the beak before the Breakin2 attempt.

We'll have a full interview with Nike Oregon Track Club 1,500m specialist Pat Casey in the next few days.