C.J. Donlon isn’t the average fifth-grader. He can stack a batch of 12 cups and break them down in a similar succession really fast, to the tune of 7.09 seconds.

“We do it in our physical education classes sometimes, and the kids absolutely love it,” said St. Mary Academy PE teacher Vikki Graham, who occasionally on rainy days will break out the “stack mats” and let her students go ballistic. “Speed stacking is even more fun because it’s a bit more challenging.