March 24, 2011 02:00 PM

Michael Buckner/Wireimage

Just because she’s pregnant with her second child doesn’t mean that Jessica Alba has stopped exercising!

With the help of Reebok master trainer Yumi Lee, the mom-to-be is modifying her regular routine to accommodate her bump.

“I have Jessica doing exercises to keep her core strong and work on her balance,” Lee tells InStyle.com. “We do curls using a stability ball, single leg balance movements and compound moves like squat thrusters.”

According to Lee, Alba’s fave exercise is a simple plank using a stability ball, which helps maximize muscle tone while improving balance.

But before you (and your bump!) hit the gym, there are a few things to keep in mind: “Monitor your heart rate and body temperature and be careful when attempting moves that focus on the back, or involve twisting,” Lee advises.

And as most celeb moms know, working up a sweat while you’re pregnant definitely has its benefits. Lee says that most women who practice pre-natal exercise bounce back to their pre-pregnancy shape faster than women who don’t.

TELL US: What was your pre-natal exercise routine like?

Also, check out our Bodywatch section for more celebrity exercise secrets.

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