I currently training for a Marathon. Do you have any advice?
Wear good shoes because it is a road race.
Yes, I'm afraid I have not been training enough. 
Most marathons are 42.195 kilometres, so I hope you can handle it.
No problem. I'm Native American my people were born to run. 
Just think of it as training for an Olympic event because it was one of the original Olympic events in 1896.
I'm actually using it to train for an Iron Man triathlon. 
Well there are more than 800 marathons a year in the world, so i'm sure you will get plenty of practice.