
1. Damage to joints
Running for a long time can damage the joints of the human body, especially the knee and ankle joints. When running, the joints of the human body need to bear more pressure than usual walking, and the joints are repeatedly impacted by this force, which causes strain on the joints and declines in function.

2. Inhalation of smog
Due to various factors, the smog is getting worse, and the air quality is not good in the morning or in the evening. Running as an aerobic exercise requires sufficient oxygen, which can also inhale a lot of haze, causing damage to the respiratory system.
3. Exercise addiction
After running for a long time, people will gradually become accustomed to or even become addicted. Once they become addicted to exercise and excessive exercise, it is no longer a healthy exercise. It will increase the burden on the body, worsen the spirit, and threaten physical health.