Overpronation
Overpronation - with this type of movement we initially make contact with the ground with the outside (back) of our heel. The picture below shows the "initial contact" of a runner. You can see how his heel strikes the ground.
As we transfer weight (see picture below) to the metatarsus, we will transfer the weight too far inward on the metatarsus and will move the weight more toward our big toe (versus the center of the metatarsus). We will have too much weight on our big toe. Also our knee will tend to be too far inward. With this movement, we will not absorb shock efficiently. Wikipedia has given an analogy to a diving board in which as we dive, the board never returns to its original position and just bends all the way down to the water. We therefore do not benefit from a returning spring back into original position. Sports men and women with “overpronation”, when injuried, often suffer from similar injuries. Overpronators also often wear out the outsoles near the area of the big toe faster than a
"neutral"
or
"underpronator".
In the picture above, the runner is now transfering his weight to the metatarsus. Please note that this runner is not necessarily an under or overpronator. This is simply a picture to illustrate the weight transfer to the metatarsus. 
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