how on earth do you maintain a healthy diet and exercise routine in law school

1L here in the process of studying for exams. My health has taken a complete backseat since starting in August. I had lost 70 pounds a couple years ago, but I fear I’ve gained quite a bit back this semester. I desperately want to get healthy again, and I know how to, it’s just like I have no motivation when I’m also trying to read, outline, and sit in class for four hours everyday. Anyone who has tips or advice please let me know lol.