The "Wisconsin Winter Stack Up" hosted some of the country's fastest cup stackers. Sport stacking is a competition in which competitors stack specially designed cups up and down in set patterns. Speed ...

Editor’s note: This segment was rebroadcast on Sept. 30, 2025. Click here for that audio. In the early 2000s, thousands of U.S. schools had their students race the clock to stack cups in gym class.

MILFORD — A room full of Woodland Elementary School students watched in awe Tuesday afternoon as 17-year-old Seamus Stoker whipped a dozen lavender-colored cups in and out of pyramid-shaped stacks.