Nightly News | October 11, 2011
You're about to see a couple of firsts here: the first lady Michelle Obama and the first ever group jumping jack attempt in the backyard of the White House . It's part of her effort to get kids fit. It was led by our friend Al Roker , hosted by National Geographic Kids . Four hundred kids jumped their hearts out, part of a global effort to break the world record for the most people doing jumping jacks across the globe at once.