Another way I look at this:
We don't hunt anymore, at least not in the traditional sense (I must assume that taking an elk at 250 yards with a .300 magnum is a bit different than running it down with an atlatl or spear).
Male or female, with the exception of our military, we don't have a warrior class either. We don't fight. We really have no reason to ever have to try to do anything at maximum physical capacity. There are no consequences, social or physical, for not being able to physically rise to a challenge.
Nobody HAS to climb or run anymore. If you do, it's a game.
Yet I think our bodies are hardwired for these activities, for struggle, and for the adrenaline rush.
But in 2010, it's pretty safe to say that the majority of citizens in wealthy countries are completely disconnected from their biology. They live vicariously through books, TV, movies, etc., getting their danger and adventure through surrogates.
Others, we invent physical games.
Rock climbing. Whitewater kayaking. Free diving. Ultrarunning. There's no real reason for these activities, at least no direct benefit to society in them. Yet some of us, our bodies and brains still crave struggle and the greatest thrills we experience are those that come after adrenaline surges or long periods of physical effort. It makes us feel alive, like we're doing what our bodies were MEANT to be doing.
It seems that the majority of people out there either resist these urges and go back to bed, talk themselves out of them with seemingly practical "it might be dangerous" arguments, or are altogether oblivious to them.
I say keep struggling, it's what we were made for.