Yes, the need for humans to run is the evolutionist's explanation for the shape of our legs... but why not have 4 legs like horses and other mammals who need to run, especially our predators? Why not have 4 legs and 2 arms? Whose idea was this 2 legged liability of slow primates anyway?
Wings are better than legs, so where's ours?
I think it came from climbing trees, but I sure miss that tail, like those monkeys in SA have. It was better than an opposing thumb!