Normally, due to the positions of the bones of the foot, the foot is arched both from front to back, and from side to side. The arches are strengthened by ligaments and tendons. The arches help the feet support the body, and with the muscles and ligaments, they act like springs to propel the body when running and walking.
This reduces wear and tear on joints and conserves energy. Nevertheless, different reasons may lead to a condition when the foot arches become flattened, allowing the entire soles of feet to touch the floor when standing. This condition is called fallen arches or flatfeet. When the arches flatten, the feet roll inward. This results in misalignment of the leg, changes in body posture, and gait disturbances.