Nah, sometimes you just don't want to run anymore. I've definitely done 10k runs, and just stop and look for a bus home. It's not even that you're too tired to

Nah, sometimes you just don't want to run anymore. I've definitely done 10k runs, and just stop and look for a bus home. It's not even that you're too tired to run (though that plays a role). Some people can just keep running as long as they keep in the flow. When you lose it, running quickly becomes boring.