Find yourself a workout friend. They can be same or opposite sex, that doesn't matter. The only thing that matters is that you should like them. In that I mean that you should not want to be finding ways to get out of working out with them. You should feel like you want to go workout for the social time as well as the exercise. You should feel like you're missing out when you don't go work out with them. Once you find this person, it will be easier to keep a regular routine.

Good luck!

Another way to keep going and to motivate yourself to get to the gym is to make an appointment. That may sound silly, but if you make an appointment with yourself and put it on your calendar, you will feel more obligated to fulfill it. For many people, going to a class or seeing a trainer at a certain time is helpful. Write on your calendar "8:00 run in park for thirty minutes."