That's good and all, but wth is the point of breaking boards and cinder blocks besides showing off? Who in their right mind would jeopardize their hands, feet and digits for a show? A fucking circus performer, that's who. I don't see the purpose of taking more risks than I need to.
I know you're just a troll, but I'll pretend you actually care for just a second.
Those boards are not scored. They are 10 x 14, 8x12, or a similarly sized 3/4" PINE board. Which, if left to dry, can be broken easily by hitting yourself in the head with it. Boards are not dried in belt testing - they can be dried for exhibitions.
FYI, I was a blackbelt in Tae-Kwon-Do. I say "was" because I stopped practicing 2 decades ago.
The concrete is porous cement that breaks fairly easily. You'd bloody your knuckles a bit: most people I know tape up before breaking those.
The equality here, however, isn't whether they are hard to break. Those boards (2-3 stacked) have the approximately the same breaking strength as an upper arm or lower leg. They are training to cripple and put people out of service. One concrete block is about the same as three-four boards together. If you can break concret, you can break any major bone in the human body in one strike.
Bricks are harder than concrete. Practice makes perfect though: you need to learn to completely committ to the strike. Pull up at the last instant and you can and will be hurt if you fail to break it.
The bed-of-nails thing is a well-known parlor trick. Surface are vs. pressure, etc.
The rest of it is real. The people on the video could incapacitate you with a single punch or kick. The hitting-with sticks crap is just for show. The sledge hammer on hand is also a trick, though a dangerous one. He accelerates his hand downward just before the hammer hits, so he's actually breaking concrete already as the hammer is connecting with his hand.
Obviously, if you hit his hand while it is stationary, you would crush it.
Looks like a marketing video. Some of it is real, some of it is for show.
Funny story on the side: during belt testing, one of the kids brought in boards. The bottom one broke as he was setting them down. He had baked them in an oven to remove all the moisture and make them brittle. The instructor broke each one, over the students head, while the student was laughing. Then he gave him uncured boards to break (as all the testing is done with uncured boards).