Start the countdown! In “Houston” you will have to make all the Jump squats, sit-ups and burpees in sets starting from 10 repetitions, then 9, then 8...until you’ve got no more numbers left. Start moderately and increase your pace during each workout. You have 20 minutes!
Scaling: If this variation is too hard for you, scale “Houston” by skipping one set of repetitions after each one completed, so your countdown would be 10-8-6-4-2.