And its absurd, yes you get stronger bones, but you also risk serious long term effects(Ask Mas Oyama..). There is a reason most, even old martial arts, without knowing it have adapted wolffs law when it comes to training regarding bone adaption, realizing that not all old school is optimal.
The principle that every change in the form and the function of a bone or in the function of the bone alone, leads to changes in its internal architecture and in its external form.
As an example, wich I have used so many times before, english medieval archers. Their bones adapted to the point that archeologists can instantly spot a archers skeleton.
Skeletons of longbow archers are recognisably deformed, with enlarged left arms and often bone spurs on left wrists, left shoulders and right fingers
That is a direct result of continual training, not breaking their bones.
When you hit a wall the bone gets micro-fractures, the body reacts by making the bone stronger and thicker.
No, what happens is the body reacts to the trauma involved and like with any bonebreakage, makes the damaged area stronger to avoid further trauma. Now, the only part that gets stronger is that
precise area.
So lets say you punch a wall with that method, and you get MF on your knuckles. Now those will heal stronger.
Follow wolffs law of dynamic adaption, lets say use a heavy bag etc, and your body will adapt by making all the bones involved in the impact stronger
Shaolin monks kick banana trees 100 times a day per leg to make them harder. Same principle
That would be muay thai fighters. Shaolin uses a different training method, and one that is more gentle, but equally effective(but not as dangerous). They use a medium, aka something that lets the power be transferred somewhere else, NOT directly back into your own body. Beanbags, sand, phonebooks etc are all good mediums
Example:
Heck, I have broken tons of brick etc over the years and I have hard hands, I have never done any of the break a bone nonsense.
