Zen Habits has a post on Minimalist Fitness: How to Get In Lean Shape With Little or No Equipment. About ten years ago I was stuck in Ghana with a lot of free time on my hands. I decided to put some effort into getting into shape with no equipment. Sadly, I knew little to nothing about exercise, so I didn’t manage to come up with a routine anywhere as nice as this one.
My routine as I recall it involved jumping rope for 15-20 minutes, pushups, and trying to bench press my bed. It wasn’t a great full body workout, but it was better than nothing. One morning I tried to bench press my bed and it fell apart on me. After I reassembled it, I quit that part of the routine.
I don’t think I could follow Zen Habit’s exercises as a number of them involve a chin-up bar which I don’t have or involve jumping. The room I exercise in has a sixish foot ceiling, so I don’t think jumping would be too good for my mental health.