Leigh McGinley used to do 1 pull-up followed by 3 press-ups, then 2 pulls & 6 presses all the way up to 10 pulls and 30 presses as part of his session.
I indulged in some of this a few years ago. It's top.
The "Edinburgh Gutterfighters" do something similar, which I would try if I didn't have bad wrists.
dead-mans fall, 1 fast pressup, bounce back to your feet, 5 rapid chain punches
dead-mans fall, 2 fast pressups, bounce back to your feet, 10 rapid chain punches
Continue increasing numbers until either vomit, faceplant, passout or all three combined
I think it's meant to both condition your body and get you used to getting back up after being knocked down.