1. 10 Minute Rule. This has been a tried and test rule. When you don't want to run, go out and run for 10 minutes. If after 10 minutes you still don't want to run, then you can stop. Now if you ran out in one direction you will get another 10 minutes by running back home. This little rule works pretty darn good.
2. Don't go home. If you are planning on running after work, don't go home. Run from a fitness center or change your clothes in the office bathroom. If you do go home, don't sit down or, heaven forbid, lay down. Chances are slim you will not go out and run.
3. Make an appointment with a running buddy or with yourself and keep it. Nothing works like knowing someone is waiting for you. And be prompt.
4. Purchase a new pair of running shoes. Nothing motivates me like a new pair of shoes. Display them near the TV to ensure the guilt factor will take over and out the door you go. 
5. Register for an upcoming race. Having a race to look forward to will help get you through those times when you don't have a focus.
6. Run with faster runners. Nothing like some humility to help get some miles logged in.
7. Remind yourself why you run. Think about the benefits of running and use those positive thoughts to your advantage.
8. Read Articles written about running from race reports to types of training. Learning something new will help with your focus.
9. Run with others. Having a preset time to run with a running group or club is always a positive experience. You can learn what is working for other runners, who running where on the weekend, or what races are coming up. You can also find someone who might be struggling with motivation and together you can work to overcome this issue.
10. Keep a running journal. See proof to your past running. I find that when I keep a running journal I don't want to miss a workout because I don't want a blank page in my journal. Works for me.
There you go. Try them out and find which ones work for you!
