To determine which kind of running shoes you should purchase, you should first need to figure out your foot type.
A well-informed and well-trained sales clerk at a shoe store selling running shoes can guide you to determine the right type of running shoes based on your foot type, but you can also determine your own foot type, if you want to. One method is to closely observe your feet.
A more specific way is to observe your footprints by walking over sand or on a flat surface with wet feet.
Generally, there are three different kinds of feet.