The punishment of 'Riding the Wedge' featured here from time to time over the last couple of years has been featured by the website 'Russian Captured Boys'.
The hands above the head tethering used here to expose the torso to punishment also prevents the captive from using his hands to ward off the pressure on his crotch.
Although this captive's ankles are secured to the legs of the wedge I suspect they do not prevent him from grounding his feet which is probably just as well since this practice, if prolonged, is a lot more dangerous than it looks. Don't try it at home, fantasy stuff only.
Photos courtesy of Russian Captured Boys
For more examples of 'riding the wedge' click on the label below.