Almost all of those newer shows are faked, to what extent is what varies. Think about it like this: would they really sit with somebody for 8+ hours everyday just to get action? No. They stage stuff so that way all we see is the action. It's a shame but how many people would really watch a show if there was no action. Nobody, because it would put them to sleep. Now many shows way kill it with action so it looks obviously fake. Then other shows like River Monsters may have fake parts, but for the most part it was actually real.
I used to like lizard kick towing, because it was funny, though I knew it was fake it was still ok. Then they just stepped to a new level of fake and the show became really stupid.