Natalie Portman

Recently, there's been a bona fide Hollywood baby boom. And It girl Natalie Portman has been dazzling on the red carpet with her baby bump. To stay healthy while juggling mom-to-be duties, the Oscar nominee has been heading to the pool. "I have been swimming every day," the actress (pictured with her mom) tells US Weekly. "When I am in my womb-like environment, I am hoping the baby is feeling peaceful." Not only can swimming relax you, the workout can also build and lengthen muscles. Join a gym or hop in the local community pool for a few laps of freestyle and the breast stroke like Natalie.