Typically, having flat feet means you are number 3 in the picture below.  Compare it to the others – 2 being neutral and 1 to 0 indicative of high arches.

Having flat feet doesn’t mean you can’t run, it just means you have to choose a running shoe specifically designed for the condition.

Pronation is a term referring to how your body distributes weight as you move through your running stride.  Overpronation is when you have a tendency to roll (or rotate) inward from heel strike to lift off.  People with flat feet are usually in this category of overpronation and therefore require a shoe capable of reducing the rolling.  Through their rigidity, motion control running shoes do just that and they also provide great stability.  As far as insoles are concerned (that part of the shoe in direct contact with your feet), they should not be too padded or curved, as this can apply uncomfortable pressure to your flat feet.

These days many specialty sports shoe stores offer detailed foot type analysis, some even include videoing your running action as you run on a treadmill.  This is an excellent way of getting your flat feet assessed for just the right running shoe.  Of course if you have deep concerns about your flat feet and running, you could also consider visiting a podiatrist for expert advice.

Good running shoes for flat feet can make a world of difference to the enjoyment and safety of your run.  There are some great shoes out there and dedicated people to help you find them.