Those of us who workout, do so for a reason, even if the reason's because we like to workout.
Some of us have other reasons, such as health and longevity. Some of us want or need to lose some weight. Some of us have sports performance goals we want to work on.
Whatever the reason is, know what it is so you can focus on it while you workout.
Not only that but sometimes we need to dig deep into that motivation to get to a workout, or finish a workout.
We have a motivating factor inside of us, you just have to figure out what it is.
Then remind yourself of it, and see how your training benefits.