80% of running related aches and pains are caused by uncorrected pronation. Everyone runs differently. The best way to work out your own style of running is to look at the soles of your last pair of standard running shoe.
Wear: inside edge of front of foot.
-> Choose a shoe for pronators.
45% of runners
Wear: middle of front of foot.
-> Choose a standard shoe.
50% of runners
Wear: outside of front of foot.
-> Choose a shoe for supinators.
5% of runners