Solid ball and1000m

Analysis of technical action of throwing solid ball 1. Prepare the posture, with your feet open back and forth. The forefoot is about one foot away from the throwing line, and the front and rear feet are about two feet away. The right distance between your left and right feet makes you feel comfortable. The heel of the hind foot is slightly off the ground. Hold the ball naturally with both hands, relax the body muscles, put the center of gravity in front of the middle of the foot and look straight ahead. 2. Holding the ball: the fingers of both hands are naturally separated, and the index finger, middle finger, ring finger and little finger of both hands are placed on both sides of the ball to hold the ball (the distance between the two index fingers of boys is 1-2 cm), and the two thumbs are tightly buckled on the back and upper part of the ball to form a regular figure of eight or an inverted figure of eight to keep the ball stable. After holding the ball, your hands are naturally placed in front of your body, which can save strength and increase the swing range during the pre-swing. Attention should be paid when holding the ball: ① Hold the ball steadily and relax the muscles of your arms; ② You can control the ball well during the exercise, which is beneficial to give full play to the strength of your arms, fingers and wrists. Only by holding the ball reasonably can we effectively pick it up. What is reasonable? There are two ways to hold the ball, the main difference is: the first way is to put two thumbs together to form a positive "eight". The second is that two thumbs are close together to form an inverted figure of eight. The former method of holding the ball, because of the physiological structure of human body, the two elbow joints will not be very open, so there is obvious action of picking the ball → beating when shooting, which has great room for improvement compared with individuals. The latter method of holding the ball, due to the physiological structure of the human body, will inevitably cause the elbows to open wider, and the back pull of the hands will be limited, so that the ball can not be fully set aside → whipped when shooting, and it is easy to form a push action. All the students I teach use the former method of holding the ball. I once chose a boy to compare these two methods. The former invested 8.5m, while the latter only invested 7.4m Obviously, the former method is better than the latter. But when holding the ball, you should pay attention to raising your head and raising your center of gravity. From a psychological point of view, it gives people a momentum, confidence and strength. 3. Pre-swing Pre-swing is to create good conditions for improving the initial speed of throwing a solid ball in the final exertion stage. The number of pre-swings depends on people's habits, usually once or twice. In the last pre-swing, the ball is passed from front to back, and the swing speed of the ball is accelerated, which drives the upper body to lean back. At this time, the position of holding the ball with both hands is at the back of the head and the top of the head, slightly bending about 70, and the center of gravity falls on the hind foot, and the front foot can be straight. The process of "full bow" action includes pre-swing, body reverse bow and lead ball. The first is pre-swing. Pre-swing is the preparation process to complete the body's anti-bow. Lean forward slightly, relax your limbs, adjust your breathing, and swing once or twice. Secondly, the body bends back, the knee joint bends slightly, the heel of the hind foot is slightly raised, the back of the head is tilted back, the chest is lifted, and the buttocks are sent, forming a body bending action under the head reflection. Finally, the ball is led, and the ball is held behind the head with both hands, forming the anti-bow action of the arm, thus making the whole body form a "full bow" posture. There are two physiological limitations in the process of putting the ball, which affect the pull-back range: ① The angle between the upper arm and the forearm should not be too large. ② Don't open the elbows too much. So how big is the angle between the upper arm and the forearm? If the included angle is too large, the ball will fly out at a high angle, which will affect the performance. If the included angle is too small, the ball will fly without radian, which will also affect the performance. Teaching practice has proved that the angle between the upper arm and the forearm is between 45 and 90. There are four reasons: ① the range of reverse quotation can be increased; ② Shoulder joint and elbow joint are rotation axes; ③ Flexion of biceps brachii and triceps brachii can be fully utilized; (4) Reduce the restriction caused by physiological structure and make the swing arm move more smoothly. Satisfying four conditions at the same time can speed up the swing arm, and teachers should adjust the best angle repeatedly according to the actual situation of students in teaching. 4. The last effort is the main link of throwing a solid ball. The correct action directly affects the initial velocity and angle of the ball. Finally, the pre-swing is over, holding the ball with both hands and swinging forward from the upper back to the front. At this time, the sequence of action is to kick the hind legs hard, straighten the hips, and then quickly and forcefully close the abdomen and chest. The chest drives the big arm to exert force, and the big arm drives the small arm. Swing your arms forward, press your wrists and fingers forward and throw the ball forward. Hand-out stage is the process of force transmission of all parts of the body. From the longitudinal perspective, the order of forces is a process of rapid transmission from bottom to top; From the horizontal point of view, the force of each part needs high coordination and speed. The whole body and arms are whipped from bottom to top, but the whipping speed should be fast and the angle of the hand should be in the best range. Finally, hold your breath in the hard phase. Pay attention to lowering the center of gravity and controlling the body balance after shooting. Only by mastering the final stage of exertion can we throw the ball further.