First lady's 'Let's Move' tour to stop in Chicago

CHICAGO – First ady Michelle Obama will stop in Chicago this week to promote physical activity in schools.

Obama's appearance Thursday is part of a national tour to celebrate the third anniversary of her "Let's Move" initiative.

In a news release, the White House said Obama will be joined by top officials and athletes and a surprise musical guest. Among those expected are Olympic gymnasts Gabby Douglas and Dominique Dawes, San Francisco 49ers quarterback Colin Kaepernick and tennis player Serena Williams.

The White House said research shows physical activity can improve classroom behavior, attendance and test scores. But only nine states require recess in elementary schools and only 4 percent of elementary schools, 8 percent of middle schools and 2 percent of high schools offer daily physical education.