The sounds of speed, agility, and concentration where heard 'round Covington Elementary School. 

The South Sioux City 'Stackers' were just one group of thousands around the country trying to get into the Guinness Book of World Records. Kids at Covington have been cup stacking for about 5 years, and record setting for 3.

Alyssa Conley, a 4th Grader says, "It's really kind of a challenging, it's not hard, but you're really competing with a lot of people, which is fun."

270,000 stackers registered for this year's contest nationwide. In South Sioux, 2nd and 4th Graders were the super stackers.