Here's the description of the group from their website:
The Firecrackers are a performance jump rope team made up of talented 4th-8th graders from the Kings Local School District in Ohio. Coached by Lynn Kelley, they perform at venues across the country. Some notable past performances have been at the Macy's Thanksgiving Day Parade, a Presidential Inauguration and an appearance on The David Letterman Show.
The group performed at half-time during a basketball game between Army and Navy in February of 2009, the video of which I'm including below. The video is rather long - just about 8 minutes - but it's worth the time to watch the whole thing. Those girls are amazing, both in timing and stamina. I could have done without the reaction shots of the crowd - yeah, I can tell by the noise how much the crowd likes it - I wanna keep seeing the girls!
It's pretty spectacular - and exhausting - to watch, so take a seat and enjoy.