How high was this? I found this guy on YouTube, who bellyflops into a foot of water from a height of 36 feet. His speed at impact is about 33 MPH; assuming he uses the entire 12 inches of water to decelerate, his average decel is about 36 g’s. That’s a lot, but if the force is distributed in a reasonably uniform manner, it’s apparently tolerable (OTOH, 36 g’s delivered by a passenger-car seat belt is going to injure you).
One question: Has bellyflopping from 36 feet without doing anything exceptional with your hands been shown to reliably cause injury (not just pain, but real physiological damage)? If not, then it seems doubtful that the technique you describe really does anything beneficial.
I remember reading somewhere that if you are falling into water go feet first, and that it is also a good idea to clench your sphincter to prevent a high-pressure enema.
The diver in question is Darren Taylor, AKA Professor Splash; he is indeed the fellow featured in the video I linked to upthread.
Here’s slo-mo video of his landing, from a different program (Time Warp, where they, um, show slo-mo video of things). I don’t think the hand action does anything for his body, but it may help decelerate his skull a bit more gently.
BTW, he’s not the first person to do this kind of thing. As a little kid I remember seeing Henri LaMothe doing similar belly-flops at the age of 70. Can’t tell from the video whether he’s doing anything with his hands similar to what Professor Splash does.
Thanks, that shows some great shots at this. In all the videos it appears like all have used hands/arms to pre-enter the water. I think we have to assume there is some reason for it.