A goal is measurable when, on the last day, a stranger could check it. Read more is a wish. Read 8 books is a goal.
One number and a date
Pick the one number that matters. For running it's distance or time. For writing it's words. For saving it's the amount. One number, not five.
Put a date on it. Ninety days from today is a date. Someday isn't.
Work backwards
Then work backwards. If day 90 is eight books, day 60 is about five and day 30 is two. Now you know whether you're on track without guessing.