If it is the same person, walking is faster than running. I used to think race walking was ugly and boring. In the recent track and field championships, I saw that the speed of the 50-kilometer race walk is actually about 12- 13 km, and the speed of the 20-kilometer race walk is 15 km, which is much faster than that of ordinary people running by bike. We had to save effort, so we only walked a few times. Jogging 9 kilometers at ordinary times and running 4 kilometers per hour are still a little tired; The speed of these two kinds of walking is 7.5-8 km/h, and walking 4 km is obviously much more labor-saving than running. It is said that it is more muscular than running, and it doesn't hurt your knees-it is still being realized.

Now-in fact, in 1996-the rules of the IAAF have changed. There can be no "visible" flight. That is to say (the following is personal understanding, unofficial "judicial interpretation" and so on. )-First of all, admit the existence of vacancy from the rules. Holidays do exist, and in some recognized records, there will be more than 50 milliseconds of flight. Second, as long as you can't see the flight, it won't affect the performance. Third, "playback" is invalid afterwards, which also means "visible to the naked eye".

It should be noted here that some people may think that 50 milliseconds is very short. Only 0.05 seconds, but according to the data I have seen, some middle and long distance runners, such as Wang He and Qu, fly less than 100 milliseconds. If we analyze some shorter marathoners, I believe their flight time will be shorter. So from this perspective, that is to say, there is no "flying" in race walking, and there is no difference between race walking and running. -If 100% is strictly guaranteed to have a "double-support phase", the time per kilometer will not be faster than five minutes, but it may be slower than about six minutes (this is my data inference, not official data). Then walk 50 kilometers and the race will take about 5 hours.

So what's the difference between walking and running? That is, the legs are straight, and the legs should be kept straight in the vertical stage. This is the key. You can look at some photos. When the runner crosses the projection point of the center of gravity, it should be the moment when the center of gravity is lowest; It is not only a running event, but also the landing and take-off process of triple jump. And this center of gravity is the lowest, accompanied by the action of bending your knees. The legs of the race walk should be straight, that is, when crossing the projection point of the center of gravity, the legs must be straight, otherwise they will be sentenced to "bending their knees".