You Better Run

HELP!  I need motivation.  I am training for my first half marathon in November and I was doing really great with the training and now I have slacked off.  I'm headed out tonight to get back on the horse but I need encouragement.  I am trying to think about the sticker below that I am definitely putting on my car to announce to the world "I did it!"  I think I need more ideas.

What do you do to stay motivated?  Anyone?