Core exercises post baby

What core exercises did you do post baby? I'm about 10 pounds lighter than I was prepregnancy, but I definitely need to do something to strengthen my core. What core exercises did you find the most beneficial?

Right now, I'm running about 20 miles a week and lifting 2 times a week (if I have time). I also EBF my 9 month old DS.

I've used ab ripper x in the past and am willing to do it again. The problem is by DS' bedtime I'm usually wiped out and don't feel like doing the 15 minutes.

Core exercises post baby

I swear by planks. There's a ton of variations where you can lift your legs, etc while holding in a plank position. I also think standing ab exercises are good for core strength. If you google you can probably find a ton of moves.

Re: Core exercises post baby

Pilates really has helped strengthen my stomach after being completely stretched from my twins