I think the 200-meter dash should start from the half distance of about 70 meters from the finish line, and there is no so-called "slowness" in the process of running into the 200-meter dash. Go all out to finish the game. And try to reduce the number of breaths, especially in the sprint stage.
In general, it is best to run at a constant speed, but it does not rule out rushing to the end. According to your own training level, you should sprint at the beginning of the game. Don't panic, you will slow down after running for tens of meters. Then, keep your own speed, preferably with someone similar to yourself. Pay attention to breathing, three steps, three steps. Run three steps forward, keep breathing in, run three steps, keep breathing out. If you are short of breath and can't do it, change it to two steps, one is called two steps. Note: don't open your mouth too wide, or you will have a stomachache as soon as you enter the air conditioning. If it is a 400-meter standard field, it is 2.5 laps. In the last 200 meters, try your best and rush forward. You can take a deep breath at this time until you cross the finish line. I'm sure to get good grades.