Most students on a Tuesday or Thursday night are winding down for the night — but not senior Tyler Spalt. He’s warming up for two hours of full-contact practice ahead of his next football game. But he won’t be playing under the bright lights of Heinz Field on Saturday.

The Cost Center is never empty at midnight — at least not if Alyson Kornberg can help it. The rhythmic sound of shuffling feet fill the indoor field, as each movement requires precision and repetition,...