The qualified line is:
Junior high school: Grade 1 is 4'55 ",Grade 2 is 4'50" and Grade 3 is 4'45 ".
High school: 4 feet 40 inches in grade one, 4 feet 38 inches in grade two and 4 feet 36 inches in grade three.
University: Freshman/sophomore is 4 feet 34 inches, and junior/senior is 4 feet 32 inches.
Extended data
Skills of running 800 meters
1, posture
The posture of middle and long distance running should be kept in a relatively balanced state. When running, the body leans forward slightly, and the included angle with the ground is about 80 to 85. Girls' speed is relatively slow, just keep it at around 85. During running, you should pay attention to raising your head and abdomen, and your hands naturally cooperate with your steps to reduce your body shaking from side to side and unnecessary energy waste (it is best to let people correct it when running).
In the later stage of middle and long distance running, the human body is already in a state of fatigue, so it is really difficult to improve the skills and running speed. At this time, it is necessary to increase the forward tilt of the trunk (80 for men and 85 for women) to drive the body forward. In order to balance this forward leaning, it is natural to strengthen the coordination of pedaling and swinging, and increase the swing range of upper limbs to ensure that the technical movements in the later course are not deformed, and finally achieve the effect of improving the later course.
2. Step frequency and step size
It is extremely important to increase the step length and step frequency to improve the performance of middle and long distance running. However, they are contradictory. Usually, we can only keep the step size and increase the step frequency, or keep the step frequency and increase the step size to achieve the purpose of improving our grades.
3. Push and swing hip delivery technology.
Push-and-stretch is the strength from hip, knee, ankle and toe from top to bottom, which makes all joints fully stretched, supports the reaction force to act on hip and moves the center of gravity forward.
At the same time, it is also the beginning before the legs are folded. The coordination of pedaling and swinging will have the effect of hip joint migration, so that pedaling should be strong and swinging should be rapid, which can not only improve the step length, but also speed up the step frequency and reduce the fluctuation of body center of gravity. At 800M, the leg should form an angle of about 60 with the ground when it is straight (if the angle is less than 50, the speed and frequency will be accelerated, which is a sprint technique).
4, landing buffer technology
When landing, let the heel land first, but be careful that the foot surface cannot form a large angle with the ground (less than 10) or land with the whole foot. When landing, try to reduce the resistance and quickly transition to the forward pedal action. After landing, the body center of gravity moves down and moves forward at the same time.
These are two technical difficulties of landing buffer. Generally speaking, most runners are prone to make a mistake, that is, the pedal resistance is not fully reduced before landing. When buffering, the body's center of gravity is down but not forward, even sitting and running. The center of gravity of the body moves backward, which makes it more difficult to push the body and send the buttocks.
References:
Baidu Encyclopedia —— National Students' Physical Health Standard