1, which does not meet the design requirements of sports shoes: old shoes are usually designed for fashion and leisure, and the soles are thick and hard, which does not have the characteristics of shock resistance, shock absorption and support that sports shoes should have, and it is easy to cause foot pain and injury when running.
2, affecting the running posture: the thick soles of old shoes will lead to a high center of gravity during running, which will affect the running posture and stability and easily lead to sports injuries such as ankle sprain.
3, airtight: old shoes are mostly leather or artificial materials, airtight, easy to cause excessive sweating and excessive humidity in the feet, increasing the risk of foot infection.