First Lady Michelle Obama may be the first first lady to be part of a world record! She announced on Monday that her bid to help break the Guinness world record for the most people doing jumping jacks in a 24-hour period was a resounding success. In a video message on the White House's “Let’s Move” website, the "jumper in chief" said that 300,265 people shattered the old record of 20,000 people.

"More than anything, I want to say thanks to every single young person who showed that exercise isn't just good for you, but that it's fun, too," Obama said.

The first lady led 464 children from local elementary and middle schools in Washington, D.C., on the South Lawn of the White House for a jumping jacks event, which took place from 3 p.m. EST Oct. 11 until 3 p.m. Oct. 12. Anyone from around the world could participate by doing jumping jacks for one minute. The effort was organized by National Geographic Kids magazine, which technically holds the record.

In announcing the news, Obama added that there’s still lots more work to be done in the battle against childhood obesity.

"This isn't only about one day in October," she said.

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(Photo:  Mark Wilson/Getty Images)