It has also to do with ankle and knee joint stability along with foot spring action.
People with flat feet tend to have ankles and knees which cave and knock inwards. This creates muscle imbalances and weaknesses that travel all the way up to lower back.
You’ll often see them complain of hip and back pain.
Arched foot creates a strong foundation for glutes and quads, the biggest and strongest muscles in your body.
As they say…the root cause of structural cracks on 6th floor actually arise from basement and plinth
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