Update: Not one to let the first lady show her up, Beyonce dropped by P.S. 161 Pedro Albizu Campos middle school in Harlem and surprised the students mid-dance:

This may be the most amazing way to get kids to move. Dance and musicians and politicians will show up at your school!

Earlier:

On Tuesday, at the Alice Deal Middle School in Washington, students danced to Beyonce’s “Move Your Body,” while Michelle Obama watched from the sidelines. But the first lady couldn’t resist the catchy tune. Before long she was running to the left, running to the right, and waving an American flag. The song was reinterpreted as part of her “Let’s Move!” campaign. The first lady proves, once and for all, she can really move:

(Thanks, Sam!)