Totally agree. What is motivation anyway. A need/want that we strive to fill. Once it's been met, where do we go from there? And honestly, the need/want that we tell ourselves that drives our action (motivation) may actually be masked as a different kind of need/want that could easily be filled in another way and then we become distracted.
I've never had the "motivation" in the sense that I think most people assume is needed to do this. If it were to become healthier so that I could live a more enriching life with my loved ones, well then I hit that a long time ago. So it had to be a different mindset beyond just goal reaching. I just consider it my job to do this. Up until this year I was at the gym by 8:45am (after dropping my sons off from school) five days a week. Saturdays I got there at 9:00am. The only exceptions were the occasional school function or cold virus.
Yeah, motivation is kind of a flimsy thing to base the actions upon. It's great to get you started but in the long run, the actions really need to be more assimilated into who are.