Schools in Canada have kids work an exercise bike to get their heart rate up before class which helped eliminate disruptive behavior and being unable to concentrate on lessons. I tried it on myself in the morning before working through texts, definitely works.

Now I have an elaborate spin bike setup, large TV playing lectures and a bluetooth headset to hear them. I ride the bike for the entire lecture, usually 45mins-1hr15mins, and recently incorporated interval training so whenever a student in the recorded lecture asks a question, it's always one that could have been answered by reading the assigned material beforehand like the student is supposed to do, so I go as hard as possible on the bike until the professor returns to the lecture. After I have no problems concentrating for another hour or so on the assigned reading or trying the proofs in the lecture notes whereas before I as always fidgety sitting for so long during a lecture not wanting to spend yet more time staring at proofs.

I also agree with the other poster exercise usually doesn't equate weight loss since I didn't lose any weight until I started making my own food and avoiding all the takeout junk I was eating. Like everybody else I overestimated the amount of calories burned so feasted on huge pasta dishes and baguette sandwiches.