Video: Serena Williams exercise-dances with Michelle Obama & sports stars

U.S. first lady Michelle Obama crashed her hometown of Chicago on Thursday to mark the third anniversary of her benchmark "Let's Move" campaign, the signature statement of her time in the White House to date. Reducing and even ending childhood obesity is her goal, as well as getting kids to be more active. To that end, Mrs. Obama practiced what she preached, taking part with scores of children in a synchronized exercise/dance set to music. And she had reinforcements: Serena Williams joined her for the event, as did former baseball/football star Bo Jackson, San Francisco 49ers quarterback Colin Kaepernick, Olympic gymnastics greats Dominique Dawes and Gabby Douglas, Olympic sprinter Allyson Felix, celebrity trainer Bob Harper (read: The Biggest Loser), and more. Jordin Sparks showed up as a special music guest. Chicago mayor Rahm Emanuel, formerly employed in the Obama White House, and the president's Secretary of Education, Arne Duncan, also took part in the presentations. (Here's a look at Serena and Harper, with Emanuel in the background.)

Here's a look at the group getting down with that fun, beat-laden workout:

Although it seems Serena had a wee bit of trouble with the mock "swing the baseball bat 'round one's head" move there, everyone here looks great and, certainly, fit. Mrs. Obama told the Chicago kids, "I am you," encouraging them to see her and the celebrated others on stage as nothing more than fellow humans in a fight to be healthy. (See more photos from the event here.)

Here's a key quote from the first lady's address, per a White House transcript: "You listen to me—you've got to turn off the TV, move away from the screen, you've got to keep your body active, even if that means just turning on some music and dancing for an hour."

What do you think of Mrs. Obama's fitness campaign, and of the moves everyone put on at Chi-town's McCormick Place?

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