Victoria's Secret model Alessandra Ambrosio gave birth to her daughter in 2008 and graces the cover of April's GQ Brazil. So what's her post-baby fitness secret?Yoga and meditation!In fact, Alessandra hit the mat yesterday, as she tweeted: Just finished a yoga class!!! Feeling great!! And a big day ahead tomor!!! Access hollywood !! And the ellen show !!! Namaste to that!