Might as well run 400 meters at a constant speed. It is very powerful to keep the speed low. Fight if you can speed up the last 50 meters, or slow down.

1500m If it is a 400m conventional runway, speed up slightly from the last lap, and finally sprint to 100m, and always keep the front uniform. Don't fight for the first place when starting, the lead will be very tired and will be surpassed. If you are the first in school at present, keep the second position, bite the person in front, swing your arms vigorously and stride, and copy slowly (don't give up halfway)

Also, it's best to test whether you are fast in corners or straight. If you run fast in corners, practice running clockwise (usually counterclockwise). If you are fast on the straight, practice cornering crazily. The last weak sentence: I am a professional, but I don't think you run slowly at all. ...