Breaking wood... are you impressed?

[Six-Pack]

I don't care what anyone says, that has to hurt.

I broke my wrist shattering my first cement block. Hurts like a bitch the next day, but the important thing was to get through the block.

There are monks somewhere who practice by hitting an anvil with the backhand knuckles. Looks gruesome. Eventually, the hand calcifies to the point where its as hard as the anvil.