Motivation increasing workout plan

Alright, so I've noticed that I only relapse when I'm procrastinating, bored, or feeling lazy. So I could try brute force... or I could try and eliminate the root problems. Not much of a choice there.

Basically, I'm super sedentary. Not fat, because my metabolism is fast af. But sitting and lying down to do everything isn't exactly helpful. Now, being a student, I can't exactly try and factor exercise with everything I do, because there's a lot of sitting at a computer involved in it. So I've decided that I'll develop a sort of workout plan - A few times a day, I will spend 5 to 15 minutes on either cardio or short, high energy workout things that I can do in my own house/neighbourhood for free. A couple that I've come up with are jumping jacks, jogging, and high-speed pushups on a bed, couch, or other soft surface that makes it harder. If anyone has any ideas that meet these criteria, feel free to share! I posted this mostly for ideas and to share this method with anyone who may have similar problems to me.