This discussion began in: how-hard-is-it-to-become-proficient-in-weapons-based-arts-compared-to-physical-fighting-ones Human skin can toughen and thicken. I do not mean dead callouses but living epidermis. This is a fact. The toughening is not a matter of mere thickness. Honey badgers of Africa have a hide that resists puncture and cuts. Taken up into the jaws of a lion it will survive once it escapes due to this durability of its hide and I suppose flesh, since it can withstand crushing forces as well. The honey badger is a berserking mammal that will raid beehives and castrate lions, and attack poisonous snakes to eat them. Perhaps its proclivity for berserker rage lends itself to the adaptations witnessed and its success, but that is up for discussion. Naturally, it makes sense that humans would toughen up their skin into a 'hide'. I do not suggest that people should cripple themselves, or delude themselves into thinking they're invulnerable, but it makes sense that a person could resist cuts and punctures to a degree. At the very least, a slash should cut shallow vs deep after being trained, and a dull knife may not cut at all the tougher and more well trained parts of oneself. Again, don't pin idiotic silliness onto me. It's just part of martial arts that one must combat delusions and illusions but this is just fact. The heel of a person and the foot sole in general is the toughest part of them, and this is what it goes through. You walk on it. If you had to walk on your hands they would become quite tough and thick skinned as well. Repetitive impacts and weight bearing will do this. Any and every martial artist should recognize the allure and benefit of training up the durability of the body. A tougher medium will resist a cut. A knife does not cut wood deeply. Flesh can also be trained as the epidermis can to be tougher, thicker, denser. This would also cut less. Besides blades, blunt impacts would be less wounding, and not bruise if it is not strong enough. One make strike the heel of the foot against the ground and be just fine. To land on your hands takes training though. Don't be cowards that run from this training and the discussion of it.