The way in which the feet function or works will have a considerable impact on the rest of the body. The feet are generally considered as the foundation of the body and just like the tall building comparison, if that foundation is not correct, then something can go wrong higher up. There are many different kinds of alignment problems that will affect that platform and how the feet interact with the surface. That connection will have different affects higher up the body.
One of the issues that can go wrong is something that is commonly called overpronation. This word can often be used and abused, so probably should not be used. The term refers to the feet moving inwards at the ankle joint as well as the arch of the foot flattening. This really is quite a normal movement and is only a problem if there to too much of it. Why the word is such a problem is that there is no consensus as to what is too much and what is actually normal. This leads to lots of uncertainty in research and in clinical practice, especially when choices have to be made if the overpronation ought to be taken care of or not.
The impact that this issue may have on the body are alleged to range from bunions and plantar fasciitis in the foot to lower leg and knee conditions in athletes. There are various methods to treat it, again with a lot of disagreement between medical experts as to the best way to approach it. Pragmatically the treatment of the overpronation really should be directed at the cause and there is no such thing as a one size fits all. When the problem is caused by tight calf muscles, then stretching of those tight muscles would be the logical approach. When the issue is the control of muscles at the hip, then the treatment should be aimed towards that. If the problem is caused by weak foot muscles, then that is the best place to begin the rehab with exercises. If the concern is due to a bony alignment issue in the foot, then foot supports are often prescribed.