Personally, I think if everyone in the world followed this motto, it would be a better place.
When you run hard, you are happier. And it's easier to be nice to people. Just ask my 3 year old who peed in her carseat yesterday morning before she was even buckled in. I was very nice to her, even though I was furious, and I credit that mornings run.
I'm telling you, this could change the world.