Final answer:
The ligaments supporting the longitudinal arches of the foot can weaken and flatten the arches, a condition called pes planus or flat foot. Overstretching, excessive stretching, or repeated stretching of these ligaments can lead to their gradual lengthening and collapse of the arches. This can be caused by factors such as weight, prolonged standing, or walking/running long distances.
Step-by-step explanation:
The ligaments that support the longitudinal arches of the foot can become weakened, causing the arches to flatten. This condition is called pes planus or flat foot. Overstretching, excessive stretching, or repeated stretching of these ligaments can result in their gradual lengthening and subsequent collapse of the arches. This can be caused by factors such as being overweight, standing for long periods, walking, or running long distances.