Well, not really. How fast can you walk 13 miles and stop at every house and business along the way while carrying boxes and bags?
In Sibley, IA a story ran on the local news about Chris Zoet who keeps on the move by jogging segments of the 13 mile route he covers on his job with USPS.
Zoet ran competitively in high school, but eventually the running faded away for him. He said he hadn't been able to run a mile for a long time. Now that he's hustling on his mail route he could probably run nine miles.
Along the way he has dropped about 40 pounds and gotten himself back into game shape.