Couple things, me.
Whenever you know you wanted to run but when it's time and you've finished your chores and it looks like it's gonna be kind of cold and you might not like going out there, so maybe wait til tomorrow - just put on your spandex, sports bra and fresh socks and you will feel it.
Whenever you're sad, remember that all it takes is a quick car ride with somebody and your heart will turn over.