Running

I want to do a mini-triathalon in a couple of weeks. It's a quarter miles swim, 12 mile bike ride and 5k run. Today I decided to try running a bit. If you're a middle aged guy and you really want to feel mortal, try running after not having done so for a while. I'm not in terrible shape and I can ride my bike all day, but people my age were not meant to run (evolutionarily speaking, people my age aren't meant to be alive, so running probably wasn't so important back in the old days). It just doesn't really work any more.

I used to run a fair amount, but now I decided I should concentrate on being able to run the maximum useful distance for my life. I estimate this to be about a quarter of a mile. This would allow me to run for a bus or a train, get out of the rain in all but the most isolated settings, and escape imminent danger. I don't really know why else I would need to run.