The upright gait

Man has evolved, so the latest thinking goes, in such a way as to be able to follow herds of gazelles and such over long distances.

Man is not the fastest animal - cheetahs and pretty much every other animal can run faster. But the bipedal gait that we have is very efficient when it comes to endurance running.

The apes who were to become man were successful not because they were able to ambush their prey with a sudden dash, like a lion, but because they were able to keep up with the herd and wear them down.

It's a pity I hate running, really. I feel like a traitor to my species...