1, blood:

The blood quality of runners is better than that of ordinary people, and the adaptability of the body to long-term middle-distance running can improve metabolism and reduce blood lipid and cholesterol levels.

2, lung and respiratory system:

Long-term long-distance running exercise can strengthen lung function and increase vital capacity. Regular long-term running can develop the respiratory muscles of the lungs, increase the ventilation volume every time and enhance the lung function.

3. Knees:

Running can improve the blood circulation of the whole body and has a great effect on the knees. Although some people may feel pain at the beginning of running, their knees will become stronger and stronger with gradual accumulation and strength practice.