It's billed as the Ultimate Warrior Workout Challenge and what it consists of of the maximum amount of push ups, pull ups, sit ups and dips that you can perform in a minute each consecutively. The exercises are performed in the exact order listed and there are no rest periods, so the complete challenge takes exactly four minutes to complete.
I don't know that I'd use it as a regular workout, but if your were extremely pressed for time and still wanted to get in as kick butt a workout as possible - this would certainly be a good way to do it.
The video below features Nate Green, of The Nate Green Experience, and has been out for almost two months so some of you may have already come across it. Yesterday was the first time i actually gave it a shot, and I gotta tell you, it's harder than Nate makes it look. If you actually push as hard as you can and use proper (like that displayed in the video) without cheating, you will be surprised at just how intense those four minutes can be.
Check out the video here: