I also had a roommate in my freshman year, similar to you, with a beer belly. It's gone after more than a month. I practiced for many nights. There is only one exercise program: sit-ups. There are many ways, from starting to help him in leg press, going to leg press or not, to bearing the burden, not to mention the number of times of organization. To tell the truth, I was a little strict at that time, so that in the end he could do more than 300 in one night, and I couldn't do it myself.

So you should stick to it and don't treat yourself as a person or a machine. The machine won't feel tired.

Up to now, I still clearly remember my roommate lying on the ground groaning in pain. You should study more. I wish you success.