An Oklahoma university is taking a novel approach to fighting the "Freshman 15": Require all incoming students to wear fitness trackers, NBC News reported.

Oral Roberts University, a Christian university in Tulsa, announced earlier this month that all first-years must wear Fitbits — watches that track how much activity a person does. Their fitness data will be tracked by the school and will affect students' grades.

While mandatory for all incoming freshman this year, Oral Roberts said it "has opened the program up to all students," and said the campus bookstores have already sold more than 550 of the popular gadgets.

It's unclear how much physical activity the university requires of students. The university did not immediately respond to a request for comment from NBC News.

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