I headed out on my run with the spirit of a man twenty years younger.  Not my biggest regret.

Ran along a new road that turned out to be hilly.  Very hilly.  Not my biggest regret.

Jogged along a stretch, where bunnies vastly outnumbered people or cars.  Not my biggest regret.

Covered in sweat on a hot summer night, I hobbled along.  Not my biggest regret.

Night fell, as I still had many miles to run.  Not my biggest regret.

My biggest running regret?  The chili cheese dog that I ate for lunch.  Now, that is my biggest regret.  No doubt about it.