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Jessica Alba

Although the actress has said that her body will never truly be the same again after having kids, her rockin' bikini abs told a different story just four months after giving birth to daughter No. 2 when she was photographed on vacation in December, 2011. Alba told reporters that chasing a 3-year-old around the house and working out with a trainer (doing full-body exercises like Burpees) has helped her lose weight fast.

She's got the right idea, says Jenkins. "Core work is really important, because you have to rebuild all of the muscle memory in that area."A good fitness routine for new moms, she says, concentrates on increasing muscular strength, improving flexibility, and building back cardiovascular endurance.

(Getty Images)

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