When walking, the movements of abdomen and chest are naturally connected. The center of gravity of the human body leans forward slightly, creating a sense of progress, and then the feet are lifted and fixed, and supported by the feet for a short time. At this time, the swing of both hands can keep the center of gravity stable, which generally echoes the speed, so that the center of gravity will not shift. Mainly for the balance of the body, so that all parts of the body become an organic whole At the same time, it is also conducive to improving running speed. As the upstairs said, you can run without swinging, but your body is not harmonious. Stiffness and exertion will inevitably affect your running speed. On another level, I think that the constant swinging of hands will form an airflow on both sides of the body, thus pushing the body to run forward faster, just like inserting a pair of tiny wings into the body. When running, you should hold your fist lightly, bend your elbow, and swing back and forth with your arms rubbing on both sides, instead of swinging back and forth, so as not to distract your strength and form sports resistance. In addition to the normal swing of hands, the correct posture of running also includes: relaxing shoulders, keeping the upper body naturally straight, not bending the back, and taking a slightly larger stride, especially paying attention to the forefoot landing. Because the soles of normal people are arched, because most of the joints of the feet are concentrated in the front, the forefoot has good elasticity, which can cushion the external vibration and protect the human body during fitness. Feet are wide at the front and narrow at the back, and the forefoot is also very important for maintaining body balance. In addition, the forefoot touches the ground and the brake is very small, which can increase the running range and make the movement light and labor-saving. Therefore, it is best to run with the forefoot on the ground. Also, if you follow the ground with your feet, it will not only affect the running speed, but also easily damage the knee joint, and it will also cause great vibration to the internal organs and brain, which is not good for your health. It is also feasible to touch the ground with the whole foot rolling, but it is not conducive to the speed and is relatively uneconomical in the way of movement. So at the beginning of exercise, because the calf muscles are not strong enough, you can run for a while and then walk for a while, and gradually transition from rolling the whole foot to landing on the forefoot.