First lady Michelle Obama on Thursday announced an effort to engage 50,000 schools in an effort to bring physical activity back to the classroom, and she's getting a big assist from Nike.

The shoe-maker will spend $50 million on the "Let's Move Active Schools" effort over the next five years. Several other organizations are combining to donate $20 million, including the GENYOUth Foundation, ChildObesity180, Kaiser Permanente and the General Mills Foundation.