First lady Michelle Obama jumped at the chance to break a Guinness World Records title for the largest number of people doing jumping jacks in a 24-hour period.
Dressed in workout clothes, she instructed hundreds of students on the South Lawn Tuesday to "get their arms out" and get ready to exercise.
"All right you guys, I'm the first lady, I get to a do a lot of cool things, but this is really exciting," Obama told the kids.
Rubbing shoulders with world leaders at state dinners may be common occurrence for the first lady, but doing jumping jacks on the South Lawn is a once-in-a-lifetime experience.
"I never thought in my entire life I would be her today to break a Guinness World Record," Obama said.
To break the record, more than 20,425 people around the world will need to do jumping jacks for 60 seconds during the 24 hour period started when Mrs. Obama kicked off the challenge at 3:00 p.m. ET.
National Geographic Kids is behind the effort and the first lady signed on to help with her Let's Move! Campaign aimed at fighting childhood obesity.
An official from Guinness World Records will review the event.