They are being used at Harvard University, Florida State University, the University of California in Los Angeles and Mississippi State University.

Inside Higher Ed reports.

College libraries install desks on which students can study and cycle

First comes the elementary school desk, cramped and rigid (cursed by lefties everywhere), then the desk desk, in your own room in high school or college, and its cousin, the library carrel. After that, if you were lucky, maybe an office desk or cubicle. Then, of course, standing desks burst onto the scene, along with their overeager cousins, treadmill desks. Now, popping up in dozens of colleges and universities in the United States and Canada, is another step in desk evolution — a stationary bike and desk combination called the FitDesk.

Most recently, Wake Technical Community College in North Carolina installed two FitDesks in its library in order “to have a little something different that gets [students] excited about coming to the library,” President Stephen Scott told the News Observer. “A little sizzle on the steak.”

He got the idea from Clemson University, which has accumulated 22 of the $300 gadgets since 2013 and has been using them to conduct research on the effect of exercise on academic performance.