Rachel Bilson

Those curves aren't from trips to the gym. This 30-year-old's favorite form of exercise is dancing "or some sort of sport," she says.

 Rachel reinvested in tennis equipment (she played as a kid) so she and friends could hit the courts in L.A.'s Griffith Park, which is also a great place to hike. On days when she doesn't feel like leaving the house, she pops in a yoga DVD.

 

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