WASHINGTON — Michelle Obama and "Late Night" host Jimmy Fallon turned the White House into a playground to promote the first lady's "Let's Move!" fitness campaign.

Mrs. Obama and Fallon did pushups and twirled hula hoops. They competed at dodge ball and tug-of-war. And the first lady triumphed over the comedian in a climactic potato sack race.

After a defeated Fallon said, "It doesn't matter if you won or lost," the first lady replied, "It matters."

The segment was taped last month and aired early Wednesday on NBC's "Late Night" program.

Mrs. Obama has been making the talk-show rounds to celebrate the second anniversary of her campaign against childhood obesity. In the past few weeks she has appeared on "The Tonight Show With Jay Leno," "The Ellen DeGeneres Show" and "Rachael Ray."