Ok here's the thing on stummies:
Crunches are basically bogus, they'll strengthen, but only to a point. You can have abs o rock, but if there's a layer over them, they won't be visible.
It's HARD for a woman to have flat/washboard abs. Our body naturally retains more fat than a man's body does, and our fat placement can sometimes be stickier than we'd really like.
The things that I've done that have really changed my abs and my overall physique include:
Diet - Change it. Eat cleaner. If it's processed, saturated, etc., I try to avoid it (though lately I've been really bad, I admit). Stay away from cokes, sugars, simple starches, etc. If you're hungry, eat. If you're not...don't. Don't eat because you're bored, socializing, watching tv, etc.
Activity - I loathe crunches. Deadlifts, SQUATS, v-sits, pole dance, climbing...those are my activities. Oh and softball. Basically I'm saying grab the weights and learn how to use them and actually lift the things. Especially the ones that aren't covered in bright pink foam. I deadlift 30 lbs more than my body weight. It's a beautiful thing.
Bulking up - No. Not going to happen. What lots of women perceive as "zoinks bulky!" is actually just their body becoming stronger than it's ever been, but not by any stretch bulky. It's not bulky, it's just different. You have to train to be bulky.
Body fat - that's what's going to show or hide your abs. Lower it with HIIT cardio.
stumptuous.com
WONDERFUL site.