Passion

Every little boy and girl in the world can probably tell you in one sentence what their passion is in life. Do you remember when your goals in life were wrapped up in a single mission statement? "I want to be a fireman", or "I want to be a vet". Those were the days of simplicity. You were naive to the realities of life.
You were also without all the anxieties and fears that prevent you from achieving. While the grown-up version of you looks at the reasons why something is "impossible", the little version sees only "possible".
Now, it's seldom possible, or realistic, to be like a child again. We do have bills to pay, mouths to feed, and responsibilities to live up to. That doesn't mean we can't recapture some of the wide-eyed simple joy and zest for achieving our "dreams".
We may need to simplify our dreams, realising that the opportunity to be a spaceman has passed us. But, when it comes to our goals, do we find goals that reignite that childhood passion?
There is no point in setting a goal of being "bikini-ready" if you have no drive to wear a bikini, or to feel the thrill of achieving a particular look. You can't fake passion. If it's not there to drive you when the chips are down, you aren't going to succeed. You may be able to get some of the way, but to get to the endpoint you will need passion and drive.

Does this mean you shouldn't set a goal of bikini-ready?
Do so only if it is right for you. Perhaps your passion is more along the lines of being a healthy and thin-ish wife/girlfriend. That is a different goal, with different plans. (note: I hope you girls go for "bikini"-ready, as I feel the world could do with more bikini bods!).
The main point here is to aim at what you really really want to hit. That gives you the greatest chance of success. And success leads to more success.
If you really really want to be a fireman, get off your butt and go sign up. Don't sit around and live with a regret. If you want to be a powerlifter, get on the right program and stick with it. If you want to be a Victoria's Secret Model, do what you have to do to get there.
If your passion calls, only a fool refuses to listen.