Interesting and important question lisasuniquevoice
For me it's...
1: First step, knowing that you are worth it, by understanding...and constantly re-enforcing the notion for improvement and updating of your values, guidelines, dreams and ambitions. So you set your goal and work at it from then onward's.
2: Nobodies going to make it happen, any changes or improvements you wish to manifest or achieve, only you. So...make sure YOU depend on YOU the most in life. To get things done you have to incorporate exertion, by becoming active, you have to have knowledge in what you are doing and you got to have desire and the passion to be a doer, and not just a dreamer
The Water of Life changes constantly, it never stops, and we all have the opportunity to flow along, or be as some are and get stuck in a stagnant pool
I suppose its thinking back and remembering the reasons you set your goal/s in the first place, this alone should re-enforce the motivation and the action required, especially for exercising on a regular basis.