You know I actually believe that. If you look on youtube or wherever you can find videos of the Shaolin monks doing incredible things like being lifted up on the points of spears or holding a cup on their stomach even as 5 guys try to pull it off.
I also read about this one monk who trained the iron crotch technique so he could have people kick him in the privates or drag logs around with his dick.
... but yeah. This all relates to Yayoi... somehow...