Burpee prison... maybe hellish Siberian Burpee Prison would be more accurate. Burpee Prison is the name for a workout that the CIA may have thought up for "enhanced interrogation", except they wouldn't legally be able to. The workout is inspired by actual prisoners. When you don't any fancy equipment or weights but you need to get ripped to survive the yard, you get creative.
The Burpee prison workout is a modified version of the workout that necessity invented. You start with 1 burpee. Then you do 10 jumping jacks. Then you do 2 burpees. And 10 more jumping jacks. Then 3 burpees. And... you get the picture. You keep counting up your burpee sets by 1, while doing 10 jumping jacks after each set. You finish with 20 burpees and 10 jumping jacks. By the end you will have done 210 burpees and 200 jumping jacks.
It is a brutal, but effective, workout. It is also a good benchmark of your progress. Try it once a month and see how you improve over time. Or do it once at the beginning of the year and once at the end. Or however often you want to do it.
Oh, I almost forgot, your goal is to finish in less than 20 minutes. Good luck.