What are the rules of the IAAF walking race?

They were sent off because they were shown yellow cards by three different referees. Race walking is a kind of track and field sport to develop endurance, characterized by alternating walking with both feet, with long stride and high frequency, which is restricted by certain rules. Race walking evolved from ordinary race walking, but in order to walk a distance at a faster speed, the movements such as swinging arm, striding legs and turning hips in race walking have changed correspondingly compared with ordinary race walking. /kloc-in the first half of the 0/9th century, there was a race walking activity in Britain. People find that walking for a long time has a good effect on physical exercise. /kloc-by the end of 0/9, the race walking movement has been formed in some countries in Europe and America. The competition is held on the track and field or on the highway. At present, in the Olympic Games and major track and field competitions, there are men's 20-kilometer and 50-kilometer road races, as well as 30-kilometer and two-hour races that recognize world records. In addition, some countries also hold 5 km, 65,438+00 km and ultra-long distance (more than 65,438+000 km) competitions, 65,438+0 hours, multi-day and team competitions. 1908 In the 4th Olympic Games, the 3500m and 10 mile race walks were conducted for the first time, and the British athletes won. With the development of technology and training, the world record of race walking has been greatly improved. The world record for the 20km road race is1:20 ′ 6 ″ 8, the world record for the 50km road race is 3: 41′ 39 ″ and the world record for the two-hour race is 28165m (as of the end of February, 1980). The speed of race walking is faster than ordinary walking, which is due to its long stride and fast pace frequency. In race walking, the average step length is about 1 10 cm, and the step frequency is about 200 steps per minute. The average length of ordinary walking is about 75 cm, and the average walking speed is about 1 10 steps per minute. Race walking is fast, but it must meet the rules. The fundamental difference between walking and running is that when walking, your feet must alternately touch the ground, and there can be no flying stage. The rules of track and field competition stipulate: "In each step, the athlete's front foot must touch the ground before the back foot leaves the ground. When the foot touches the ground, the leg must be straight for an instant (the knee joint is not bent), especially when the support leg is in a vertical position. " If the race walkers violate the above regulations during the competition, the referee will give a warning to the 1 foul by raising the white flag. If he fouls again, the referee will raise the red flag to disqualify him. If an athlete fouls on the last lap, he may be given a warning or directly disqualified according to the specific circumstances. Source: http://202.112.18.40: 918/web/index.htm.