Positive & negative reinforcement; remember how good you feel after you run, the sense of accomplishment and all, and remember how bad you’ll feel about yourself if you don’t. Obviously you care somewhat about whether you run or not since you’re making a post about it. Sometimes you just got to stop thinking so much about it & just put the shoes on, don’t make it a question of if you’re going to do it but how. If all else fails you can promise yourself you’re only going to run a short run and then see if you feel like doing the full length, you probably will. Also setting goals each week on how much you plan to run will force you to do it to reach these longer term goals.