The foot is a masterpiece of design. Each foot has 26 bones, 100’s of ligaments, muscles and tendons. All of these components must function collectively in a really precise way to ensure that we can walk, run and perform a whole variety of actions. The foot is a finely tuned biomechanical work of art as it must co-ordinate all of the functional structures in order that it can function properly and effortlessly to perform those activities. The foot did evolve to get those capabilities on a soft ground and never wearing footwear, so a few flaws probably crept in as feet was put into footwear and it was forced to walk and run on the hard cement surfaces. Small defects which were not previously an issue started to show up in those shoes and on those hard ground. It is this that is to blame for so many of the conditions that podiatrists see in the foot today.
As an example, one of those issues is a notion known as supination resistance. This is thought of as the force that's required to lift the arch of the foot. If this force is higher, then the muscles and tendons need to work harder and the ligaments have much more strain on them. This might lead to pain in those structures as well as the development of a progressive flat foot. If that force is higher, running and walking also requires more effort and could be very fatiguing. If that supination resistance force is too low, then it will be an easy task to raise the arch of the foot. This might result in more ankle sprains because it is so easy to tip the foot over to cause that. From this it should be clear that a fine balance is required between excessive and too low amounts of force which is a good illustration of precisely what an engineering wonder the foot is and just how easy it is for something to go wrong.