You might think that running is all about training your body, but what about the mighty gray battery that powers it all? Your brain is your greatest training ally because it helps to keep you psyched throughout your entire training journey.
You might want to try visualizing your runs beforehand, which can actually prepare your body for the exertion. Or, you can use your brain to trick yourself into continuing the run, even if things get tough. Just pick a landmark and tell yourself you'll stop running when you reach it -- then pick another one.
Mantras may sound like things used by mountaintop hermits in caves, but they're really quite simple. You can choose an inspirational phrase, a line from a song or a single word that you repeat over and over again. Repeating a mantra can take you away from the discomfort of exertion and make the miles go by a little more effortlessly. Likewise, just five minutes of meditation a day can train your mind to focus, making it a powerful tool to swat negative thoughts away during your run.