I get all of this. I used to be a tank. Solid, always moving over any obstacle. Lean, strong, never breaking down, until I did. Then another piece and like you said, "there's always more." Now I have weight I never had.
Now I'm going to try and make you laugh.
I told myself-"Self, if you look down and your belly blocks a clean line of sight to your dick, then you're fat and it's time to deal with it."
I look down and there's knoll. Not quite a mountain, but a definite hump. It's in the way.
Then I found a clause that keeps me from getting un-fat. A whip of the hips, a thrust of thighs, and he swings out. Technically, still in view.
I've got to find a way to move again.
Age+weight gain+"more" = this isn't fun.
I'm going to try and make you laugh.