Michelle Obama and the jumping-jack brigade outside the White House in October. (Pablo Martinez Monsivais/AP)

Remember all those kids doing jumping jacks at the White House in October? “Jumper in chief” Michelle Obama led 464 local students on the South Lawn in an effort to break a Guinness World Record for the most people jumping in a 24-hour period — the old record was 20,425. On Monday, National Geographic Kids magazine and the first lady revealed the results of the challenge.

“Today, I am proud to announce we broke that old record — and not by just a little bit,” she said in a video about the “Let’s Move” project. “With your help, we had 300,265 people jumping that day.”

To be fair, not every kid at the White House did jumping jacks for required one minute — some were so excited to be with the first lady that they just bounced up and down next to her. Apparently not a problem, though. It’s the fifth Guinness record the magazine has helped engineer, following Longest Line of Footprints and Largest Gathering of Plush Toys, among other things you didn’t know they kept records on.

Read earlier: Michelle Obama leads jumping-jack world-record effort at White House (photo, video), 10/11/11

see video. . .

Video: First lady helps world record attempt