Find a training partner. Find a friend who likes to work out the same way you do. Coordinate your calendars and commit to your schedule. You're much less likely to blow off a workout if it means blowing off a friend. Let the music move you.
Music is a great motivator.
It gets your body moving, even when you don't feel like it. The faster the beat, the better your chance of keeping up with it. Do it with class. Going it alone is great for some people, but most of us benefit from working out with a group. So take a lesson, or join a class.