Knees

I've been re-reading Haruki Murakami's What I Talk About When I Talk About Running, and was struck by this little ode to leg joints:

'If you're a long distance runner who trains hard every day, your knees are your weak point. Every time your feet hit the ground when you run, it's a shock equivalent to three times your weight, and this repeats itself perhaps over ten thousand times a day. With the hard concrete surface of the road meeting this ridiculous amount of weight (granted, there's the cushioning of the shoes between them), your knees silently endure all this endless pounding. If you think of this (and I admit it's something I don't usually think about), it would seem strange if you didn't have a problem with your knees. You have to expect the knees to want to complain sometimes, to come up with a comment like, "Huffing and puffing down the road's all well and good, but how about paying attention to me every once in a while? Remember, if we go out on you, we can't be replaced."

'When was the last time I gave my knees any serious thought? As I was pondering this, I started to feel a little remorseful. They're absolutely right. You can replace your breath any number of times, but not your knees. These are the only ones I'll ever have, so I'd better take good care of them.'