Gisele Bundchen worked up a sweat at a gym in Studio City, Calif. on Wednesday; as she left, the supermodel mom was snapped in a gray tank top and black spandex pants. (See more pics of Gisele's workout bod at!)

Bundchen, 29, gave birth to Benjamin -- her son with husband Tom Brady -- last December in their Boston penthouse. (The child was born in the bathtub, with a friend from Brazil serving as midwife; Brady, 31, and Bundchen's mom were both present.)

The supermodel recently told Vogue she "gained only 30 pounds" while carrying Benjamin but "felt like E.T.."

She remained mindful about what she ate, however. "I think a lot of people get pregnant and decide they can turn into garbage disposals."