By Andrea Reiher
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December 12, 2011 10:17 AM ET
First Lady Michelle Obama is now a world record holder. She announced in an email Monday morning (Dec. 12) that her effort with National Geographic Kids to break the record for the most people doing jumping jacks in a 24-hour period has succeeded. Mrs. Obama says 300,265 people participated, which has shattered the old record of 20,425 people.
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