My kids have killed my abdominal muscles. And no matter how much weight you lose after you have a baby, things definitely shift. I'm pretty sure they shift in the wrong direction.
I just can't get that excited about crunches and planking. But this to me this exercise from FitnessMagazine.com looks like it might work your abs AND clean your hardwood floor at the same time. Boom. Give it a whirl!
Work it out!