At least how long do you have to hold the barbell in a formal weightlifting competition?

1 Draw: Conducted at a technical meeting. The chief recorder and recorder will be led by the vice president and the recorder in the order of the conference order book, and the athletes of each team will conduct a one-time lottery.

The lottery numbers determine the order in which athletes weigh themselves and the order in which they try to lift. When drawing lots, there is no level, and the number of lots is determined according to the number of athletes participating in the conference.

2. Weigh yourself: The athlete starts weighing 2 hours before the competition. The weighing time is 1 hour, and the abstention is made when it is outdated.

3 Try-lift sequence: The athlete who tries to lift the light weight will do the try-lift first. When the weight of the first attempt is equal, the order is determined by the number, and the one with the smaller number is lifted first. In the second and third attempts, if the weight of the lifting is equal, the order of the previous attempt will be followed.

4 Weighting principle: The weight of the barbell is gradually increased, the weight of the trial lifting must be a multiple of 2 5 kg, and the record lifting must be a multiple of 0 5 kg. A minimum of 2 5 kg must be added after each successful attempt.

The weight of the barbell on the field must not be less than 27·5 kg.

5 Change of trial weight: Athletes who request a change in their trial weight must do so before the last roll call. In the event that the card is not filled out in time, the coach or athlete may verbally request a change in weight. However, the weight can only be changed twice per attempt.

7 Record-breaking requirement: A new record is recognized as a new record if the weight of any successful lifting attempt exceeds 0 5 kg or a multiple of 0 5 kg. Once a new record is set, no one else can break it with the same weight.

The total score must exceed the original record by 2 5 kg to be recognized.

8 Ranking evaluation: The highest weight lifted in the three attempts of snatch or clean and jerk is a single achievement, and the ranking is determined by the result. The overall ranking is determined by the sum of the snatch and clean and jerk.

In the event of a tie, the lighter weight before the race will be ranked first. If the results and weight are equal, the athlete who lifted the weight first will be ranked first.

Three seconds. More than three seconds is considered a valid score, and if it is less than three seconds, it is not considered a valid score.

Weightlifting generally requires three seconds, which are crucial for weightlifters, who need to lift the barbell above their head and keep their body stable and not shake their hands and/or legs. Under the premise of the standard weightlifting action, keep the shirt dry for three seconds, and the athlete's weightlifting performance can be considered qualified.

Three seconds. In this way, it can better confirm the strength of those people, and it is fairer for some people.

This question is actually very subjective, because everyone's body structure is different, so when performing the barbell press, there will be appropriate differences.

We can understand it this way, when we do the barbell press, in fact, the most important action is the push, not the action of our feet, but the action of the feet will directly affect the stability of the individual press. If a person does not do a good job of foot movements, it is likely to cause the whole barbell press process to be deformed, and even affect a person's safety issues.

The degree to which the feet are open is actually related to a person's body structure.

This reason is very easy to understand, because everyone's body proportions are different, so everyone will also have slight body adjustments when doing different fitness movements. When we do the barbell press, in fact, our feet should be as open as comfortable as possible, so that our body is in a relatively stable state. <>

Spread your feet about shoulder-width apart.

If we go by the most standard posture, the feet are generally open to the same width as their shoulders, but not everyone is suitable for this width. Let me focus on a few misunderstandings about the feet:

First, do not have a knee buckle, because the knee buckle will cause a person's knee joint to be damaged, and we cannot have a knee buckle when doing any exercise.

Second, do not have knee hyperextension, because this will also increase the burden on a person's knee joint, which will not only cause our movements to be deformed, but also cause safety problems. <>

The foot action of the barbell press can be understood as the action of squatting.

If you've done squats, you'll know that squats are very complicated, and everyone adjusts their footsteps according to their own physical condition. When you do a barbell press, you can actually refer to the technical movements of the squat, but don't take the footwork as the core of your force, after all, your main goal is to do the press, not to do the squat. <>

In the end, I hope this helps you.

It's about seventy or eighty centimeters, which is a standard for girls, and it should be seventy or eighty centimeters or even one meter for boys.

During the barbell press, it is best to spread your feet about 60 cm, as long as they are shoulder-width apart.

Summary. Hello Dear Hello, I am your professional advisor to solve your problems; A barbell with a mass of 100 kg falls from the position of meters away from the weight table to the weight table when the weight lifting action is completed, and stops in seconds, then, the impulse of the barbell to the weight table is 380

A barbell with a mass of 100 kg falls from the position of meters away from the weight table to the weight table when completing the weight lifting action, and stops in seconds, so what is the impulse of the barbell on the weight lifting table?

Hello Dear Hello, I am your professional advisor to solve your problems; A barbell with a mass of 100 kg falls from the position of meters away from the weight table to the weight table when the weight lifting action is completed, and stops in seconds, then, the impulse of the barbell to the weight table is 380

In the case of a force acting for a very short time, the product of the acting force and the acting time or the integral of the force in this short period of time is called the impulse.

Weightlifting events are divided into snatch and clean and jerk.

The first is the snatch competition, which involves lifting the barbell with both hands above the head while the body is under the bow, and then standing up and standing up straight, keeping the body relatively still. Then there is the clean and jerk, which also has three chances, it is to first lift the barbell to the shoulder part of the neck, the person remains upright, and then raise the barbell with both hands above the head at the same time half a pier or stride, and then get up and stand up straight, keeping the body relatively still.

The 2008 Olympic Games is adjusted from light to heavy from the barbell, and does not like to adjust downward, only upwards, at least 1kg of weight. There are three referees present, and the ruling of three lights, if there are more than two white lights, it is considered a successful pass, and the results will be credited. If there are more than two red lights, it is considered a failure, and it is not considered a grade.

Analysis of test question A: A. The gravitational force on the barbell and the supporting force on it symbolize the condition of the balance of two forces, so it is a pair of balanced forces, so option A is correct;

b. The gravity of the athlete and the support force of the ground are not equal, so they are not a pair of balanced forces, so option B is wrong;

c. Because the work needs to exert force on the object, and the distance needs to be moved in the direction of the force, and the athlete supports the barbell upward, but no displacement occurs, so option C is wrong;

d. The pressure of the barbell on the athlete and the support force of the person on it act on two objects, which is a pair of interaction forces, not a balance force, so option D is wrong

Therefore, choose a Comment: Knowing the conditions of the equilibrium of the two forces, knowing the conditions of the interaction forces, will distinguish the equilibrium force from the interaction force, and will judge whether the force does work on the object

The height h lifted by the athlete is about 2m, and the work he does on the barbell is: w=fs=;

The average power is: p=wt

1275w So the average power of the athlete in the process of lifting the barbell is about 1,000 watts, so b is correct

Therefore, dress up with a branch selection: line wax b