My motivation? Hate for obesity, not in general of course, I'm talking about specifically and solely me, the obese lardass.
At my peak, I was 350 pounds, and it was horrible. I was going nowhere, and fast because I was stupid to myself, ignoring the fact that a person's worth (again, talking about me specifically) is a number, a number lower than 180. Anything over that is worthless, and a waste, so I did something about and ran.
And I kept running.
And I will keep running.
Right now, I don't have that much time to run, so I have to run only 1-2 times a week whilst starving myself at 1400 calories a day (with doctor approval, vitamins, and water of course, don't be dumb), and am 171 pounds. My goal is to be 160 pound one day, while still being healthy, or 180 pounds with muscle (which itself is a problem due to dysphoria and such)
My motivation is self-worth, I value myself to much to ever be a worthless unhealthy slob again.
No regrettably, my motivation isn't considered healthy. I acknowledge this. My advice? Follow a doctor and try small, monthly goals for healthy, realistic fitness and health results.
But yeah, starving sucks... I've had only 850 calories all day.