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First lady Michelle Obama leads kids in jumping jacks record attempt

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Pablo Martinez Monsivais / AP

First lady Michelle Obama hosts local children on the South Lawn of the White House in Washington, Tuesday, Oct. 11, 2011, as they attempt to break the Guinness World Records title for the most people doing jumping jacks in a 24-hour period.

First lady Michelle Obama is aiming for a world jumping-jacks record Tuesday. NBC's Brian Williams reports.