Mom of Multiples...success in the tummy dept?

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I have a long ways to go...but I want to know what you did to help the tummy area...

I had a singleton (9lbs8oz) and I carried twins to 38 weeks (7lb7oz and 7lb2oz...I was huge but healthy!).

I'm developing a slow love/hate for planks. What can be done for that lower stomach area that we all hate?