One of the advantages that we humans gained when we first began to walk erect is that we were able to use tools far more effectively than the kinds of apes which depend on their hands for their locomotion. While this is great at allowing us to run well, throw things effectively and use the tools which have made our lives a whole lot easier to handle, it has also given us the disadvantage that we have a bizarre additional curve to our spines which other primates do not have in theirs. While this curve does allow us to remain upright, it can also be the cause of a whole lot of strain and pain, if we use it in a way for which it was not designed.
The design of most primate backs is a simple C curve. They hunch over, because that is how they are designed to work. In the distant past, humans were precisely the same way. And perhaps one day our spines will take on an inverted C shape, but for the time being we have an S shaped spine about us. If you have ever lifted something incorrectly (or simply something extremely heavy), then you can cause yourself great pain by compressing the vertabrae which work to support your spine (as well as your upper body and anything you might be carrying).
It is as a consequence of our particular evolution that we are not built perfectly. After all, a human body is, like the results of all other kinds of evolution, merely the product of the creatures who were successful at reproducing and whose offspring also survived long enough to breed their own children. While there may have at some point been a type of human which had a perfectly shaped spine for standing upright, that person obviously did not make it sufficiently well to continue their DNA down to the present humans who now walk the Earth.
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