Your feet or calves hurt when you walk or run for a long time.
When you stand you use the outer part of your foot to support yourself.

It is a very common condition in young children. Having flat feet is where one or both feet have little or no arch.
It is important to correct it when children are young because it can lead to knee and ankle problems.

You have to wear special insoles in your shoes that help your foot have the correct shape.
It's good to walk on soft surfaces such as the sand at the beach. This helps strengthen your feet.