Fitness for someone who sleeps 5 hours and has 20 minutes maximum

I am not looking for abs. I am looking to not be out of breath carrying two toddlers up two floors. Constraints: 20 minutes on a good day, at home, after 2 pm when I wake up, no equipment except the floor and a wall. Energy level: low. Motivation: my twins should not have a father who cannot play with them. Is 20 minutes of anything even worth it? If yes, what would you do with it? Bodyweight stuff, a walk, skipping? I need something I can do half asleep without hurting myself.