First lady Michelle Obama exercises with children from Chicago Public Schools, in her hometown of Chicago, as she makes a major announcement helping to bring back physical activity to area schools, while celebrating the third anniversary of her 'Lets Move' program , Thursday, Feb. 28, 2013, in Chicago. (AP Photo/M. Spencer Green)

Associated Press
First lady Michelle Obama exercises with children from Chicago Public Schools, in her hometown of Chicago, as she makes a major announcement helping to bring back physical activity to area schools, while celebrating the third anniversary of her 'Lets Move' program , Thursday, Feb. 28, 2013, in Chicago. (AP Photo/M. Spencer Green)
First lady Michelle Obama exercises with children from Chicago Public Schools, in her hometown of Chicago, as she makes a major announcement helping to bring back physical activity to area schools, while celebrating the third anniversary of her 'Lets Move' program , Thursday, Feb. 28, 2013, in Chicago. (AP Photo/M. Spencer Green)
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