Leg movement is that the legs alternately push backward and swing forward. The rear pedal directly determines the speed. The rear pedal should be stretched and relaxed, and the direction of force should be consistent with the direction of action, that is, the angle of the rear pedal should be small. Correct back push requires full hip delivery. The thigh should swing forward quickly, and the calf should relax and droop naturally during the swing forward. Press down quickly after swinging up, and the calf should follow the swinging up. When the thigh begins to fall, the knee joint should be naturally straightened. After the foot touches the ground, the knee joint of the landing leg should be slightly bent. The forefoot touches the ground first and then transitions to the whole foot, which can cushion the impact when the foot touches the ground. The landing action should be elastic, so as to make a good transition to the back pedal action. The landing point of the foot should be one foot to one and a half feet in front of the projection point of the body center of gravity. Defying gravity when landing, don't collapse your feet, so as to keep the flexibility of running. The technique of landing on the ground with feet is related to personal characteristics, training level, running speed and distance. There is also full-sole landing and followed by full-sole landing. The key is to have a transitional buffering process to reduce the impact on joints and prevent injuries. Heel landing is easy to form a sitting run, and the landing process takes a long time, which is not conducive to the improvement of speed. However, for general fitness running, it can also be taken because of the small impact after landing.