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.

Blink and you might just miss it. The blur of crisscrossing hands and zigzagging neon cups is probably the weirdest organized sport you’ve never heard of. Dubbed sport stacking, this rapid-fire ...