First lady Michelle Obama's initiative to end childhood obesity has brought a number of athletic events to the White House but Tuesday's was a bit different as she led around 400 kids in classic calisthenics, kicking off a Guinness World Record attempt for most jumping jacks.

The White House says Mrs. Obama served as "jumper-in-chief" but before all the jumping got started, she used the event as a platform to push her "Let's Move!" campaign that seeks to persuade kids to become more active.

"[T]he world is going to see just how much fun we can have not just breaking a world record but also doing some exercise, right?" Obama asked the excited, and sometimes unruly group of Washington area school kids. "You can do it just dancing around in your backyard. You can get moving if you're walking your dog. Or you can get moving doing some jumping jacks, right? There are so many ways to keep moving."

The first lady then joined the kids and led them in one minute of jumping jacks with more than 800 arms and 800 legs flying back-and-forth across the White House South Lawn.

The group of White House jumpers was observed by an official from Guinness World Records. To break the record, more than 20,425 people from around the world will have to do jumping jacks for one minute.