I found
this via the
Art of Manliness blog. The in-blog caption for the video reads:
"These are insane. Do not attempt unless you are supremely fit. Start off in a standard push-up position. Lower yourself to the ground. Explode your entire body off the ground and perform a jack knife by touching your fingers to your toes in mid air. Return to starting position. Repeat if you haven’t killed yourself."
I particularly like the part about not killing yourself...