Bouncing-Understand bouncing from a physical point of view, and you will ask many questions worth pondering. (1) Why doesn't the high jump need a long run-up distance, but the long jump needs a long run-up distance, and you should sprint quickly before taking off? Is the farthest takeoff angle about 45? Assuming that we don't consider the influence of the relative movements of various parts of the body (hands and feet) in the air, we can regard the high jump and long jump as a kind of projectile motion of particles. Obviously, projectile motion's shot height and range are related to the size and direction of muzzle velocity. High jumpers want to shoot as high as possible, so they try to rely on the reaction of pedaling to get a greater upward take-off speed; Proper run-up will help him increase his pedaling strength and make him get a certain speed of passing the pole. Long jumpers want the maximum range. Under the condition of getting a certain upward take-off speed and the same blank time, the greater the forward speed, the greater the amplitude. Of course, the take-off angle (throwing angle) is not necessarily 45. If his take-off angle is too large, it means that his run-up speed is not high enough. In order to improve your long jump performance, you can do the following experiments: run 100 meters on the runway, measure the average speed at every 10 meter interval, and find out how far you can run to get a higher speed. Then do multiple long jumps with different run-up distances to see under what circumstances you can shoot higher. Then make overall consideration and choose your best run-up distance from two aspects. (2) Suppose you want to take part in the standing long jump competition, can you estimate your best possible result without long jump in advance? The standing long jump is different from the run-up long jump, which mainly depends on the action of kicking the ground to get the take-off speed, and the maximum amplitude is in the case of 45 throwing angle. In order to estimate your performance, the key is to estimate the maximum takeoff speed you can achieve. What you have to do is to do the experiment of standing high jump, touch the height against the wall, measure the maximum height H you can reach, then calculate the initial speed according to the formula of vertical throwing, and then calculate the range you can reach according to the formula of range of oblique throwing. Try it, how big is the error of this estimation method. (3) Measure the power consumed to overcome gravity when skipping rope. Skipping rope is a kind of fitness exercise in winter. The others look simple, but if you jump in person, you will feel a lot of exercise. Can you estimate at least how much power it takes to overcome gravity when skipping rope? Observing the person who jumps well, we can find that he always tries to make his contact with the ground as short as possible when landing, and he can let the rope pass under his feet even if the jumping height h is very small. He let the rope pass under his feet almost at the moment when his body reached the highest point. It is assumed that the time of contact with the ground accounts for 65,438+0/5 of the jumping period. If we measure the number of hops in one minute, we can calculate the frequency f and the period t, and then estimate the empty time T'. We can get the take-off height from the formula of throwing motion. Every time we take off, we should increase our weight by h, and the work done to overcome gravity is w = mgh. Therefore, if the mass of the high jumper is 50 kg, we can jump 65,400 times a minute. If the landing time accounts for 1/5 of t, then t'= 4/5t = 4/ 15s. From this, the average power can be obtained, which is equivalent to the power when riding a bicycle quickly. The power required to make the rope rotate quickly has not been considered here. The power of ordinary people during normal labor is only below 0. 1 horsepower, which shows that skipping rope is sweating. Bounce-the factor that determines bounce. 1. Resilience is a comprehensive reflection of whole body strength, running speed, reaction speed, body coordination, flexibility and flexibility. So we can't think that just jumping all day is enough to improve the bounce. You must constantly stretch the tendons, ligaments and muscles in all parts of your body every day to expand the range of motion of your joints, and at the same time do all kinds of complex gymnastics that are conducive to improving your body coordination. The movements should be accurate, graceful, powerful and relaxed. Second, strength training is best arranged and guided by a physical training coach. If you are training by yourself, it is best to do high-intensity training 2 to 4 times a week, and you must pay attention to safety during training to avoid accidental injuries. The so-called high-intensity training is to practice with a barbell with a heavy load. There are three typical and commonly used methods: squatting with weight, lifting the bell and snatch. In short, the higher the score of these exercises, the better your jumping ability. As for the weight, number of groups, times and action specifications of each exercise, the principle is: 1. High-intensity training should be done at least twice a week and not more than four times, giving the body time to recover excessively, but it should be done all the year round without interruption. 2. The above three exercises are best arranged in each class. 3. Pay attention to the technical action specifications of high-intensity training, and don't mess around. 4, small strength training refers to the use of a variety of comprehensive training equipment and dumbbells for training. Lighter weight, more groups and times. The purpose is to improve muscle endurance, thicken muscle fibers and reduce fat. Small strength training can be done in different parks and every day, but it is best not to do it at the same time as large strength training. Whether it is high-intensity or low-intensity training, the time of a class should not be too long, and 1.5 to 2 hours is appropriate. Strength and density. Thirdly, speed training is also an important aspect to improve the jumping ability. Repeated sprint training is still necessary. 30 times, 50 times, maybe 80 times, that depends on your fighting spirit. The so-called sprint is to ask you to rush forward at full speed after you are ready for the activity, not at medium speed. Special speed training is the same as high-intensity training. You don't need to practice every day, just three hours a week. Also pay special attention to small use; Strength training is to strengthen the muscles at the back of thigh. Fourth, there are many specialized jumping exercises, such as skipping rope, hurdling, touching the hoop, touching the upper edge of the black box and even touching the upper edge of the backboard. Finally, I want to mention the relationship between nervous system and jumping ability. We already know that these qualities, such as speed, strength, coordination, flexibility and flexibility, will produce jumping power when they act on the ground in an instant, so what are these qualities that erupt at the same time in an instant? It's the motivation and motor nervous system. In other words, if you really want to be above everyone else, you must do everything possible to make your motor nervous system send the strongest pulse signal to your muscles. This intense stimulation forces the muscle groups to contract violently to generate huge energy, which in turn makes the motor nervous system more sensitive and can send out stronger impulses. The two promote each other, and you jump higher and higher. However, this is also a difficult point. Without hyper-motivation, there is no hyper-impulse in the motor nervous system, and all the so-called scientific, modern, management and training methods and means are nonsense. Finally, I wish your dream come true. Bouncing-bouncing training method is very important in nature. The most famous vertical jump training program in the United States is expected to improve the vertical jump ability by more than 20 to 30 centimeters. The exercise process is very hard, the whole course 15 weeks. For each action plan, if an action is to be done in three groups, the rest time between groups should not exceed 2 minutes. If it is finished, you need to go directly to the next project. Remember not to rest! ! The first item: half squat jump 1, go, half squat? Put your hands in front of you. 2. Jump at least 20 to 25 cm from the ground. If it is easy for you, you can jump to 25-30cm. When you are in the air, you need to put your hands behind your back. When landing, finish it once. Next, just repeat the above steps! ! !