This presupposes that I think I have a perfect set of abs, which I totally don't. However, I do feel confident and strong in my core, and the following ideas have really worked for me. And, having had two children myself, I've been there...
So, three steps. And none of them involve crunches.
STEP ONE: CLEAN UP YOUR DIET
Abs are made in the kitchen. You've heard that, right?
Abs are made in the kitchen. You've heard that, right?
I hate to say it -- but it's true that you can't exercise your way out of a bad diet. So, what's a good diet? Vegetables (real ones - potatoes/corn don't count!), fruit, and lean protein. It also means limiting refined/processed sugars. I have never been good at completely cutting out anything (hello, if you know me at all, you know sugar is my favorite food group), but I have the most success with leaning out when I'm right on point with my diet. I give myself one day off a week and that is really maintainable for me.
STEP TWO: EXERCISE HARD
Exercising hard does not mean do a bazillion crunches. It means make yourself seriously sweat for at least 30 minutes 4-5 times a week. For most people, the elliptical for 30 minutes will not cut it (I have never broken a serious sweat on an elliptical - ever).
My best advice is to incorporate HIIT training (high intensity interval training). This basically means that you do not do steady state exercise; instead you do exercises at a high intensity (speed or power), and then bring the intensity down for an equal or lesser amount of time. A few HIIT workouts:
Basic HIIT (with any movement you choose - running, walking, dancing, etc.): http://www.womenshealthmag.com/fitness/cardio-intervals
HIIT scorcher from The Fitnessista: http://fitnessista.com/2014/05/hiit-scorcher/
Summer shape up work out from The Fitnessista: http://fitnessista.com/summer-shape-up-2014-week-3-workout/
Interval treadmill workout: http://fitnessista.com/2009/08/crackers-make-it-better/
A bunch of Tabata workouts: http://www.youtube.com/results?search_query=fitnessista+tabata+thursday&page=&utm_source=opensearch
...That's enough to get you started. The point is to exercise your entire body, focusing on building muscle. This will help you burn fat all over your whole body, and for many, the core will be the first to tone up.
STEP THREE: STRENGTHEN THE CORE
Focus on becoming stronger, not becoming thinner. When you change your mindset about that, you'll be surprised how fast you become strong! Crunches, no. Planks, stability training, squats, push-ups, etc., yes!
Jillian Michaels has a 30 minute program that shows you what I mean -- she does very few crunches and really focuses on total body exercises that emphasize the core. -- Another way of showing you that you cannot spot train, you gotta work the entire body. And I promise, your core is gonna feel it!
And, that's it! Take away message: it's not possible to spot train. Working one area of the body over and over is not going to give you results - focus on getting stronger everywhere.
And, one more thing. Be thankful for your body. Give it love and focus on what is really great about it.