Considering there are over 100 muscles in your foot, there definitely is something "wrong" with a totally flat foot. A relatively low natural arch is one thing,

Considering there are over 100 muscles in your foot, there definitely is something "wrong" with a totally flat foot. A relatively low natural arch is one thing, but fallen arches is a medical condition that can cause complications and can be fixed. And it doesn't take that much attention, and no money at all. Just a few for exercises and learning to use your body correctly.