15 Minute workout?

Here is a workout that I ran across, I haven't tried it yet but plan on giving it a go just to see how tired I get.  The idea that I get from here is that you never stop moving and you are involving every major muscle group in your body.  The entire workout last just 15 mins and you go through it as many times as you can.  For those of us short on time and need a quick workout this could be for you.  If you don't have access to this equipment just improvise shouldn't be too hard to figure out.