200 meters and 400 meters are short distance events. 200 meters mainly requires high-speed endurance and the ability to maintain the highest speed time.
There is also the technology of high-speed running in corners.
To be able to breathe at 400 meters, the highest requirement is the ability to resist creatine. The speed can't be bad.
I don't know your specific situation, and I don't know if you want to be practical.
It can only be said that the warm-up and preparation activities of track and field are self-evident during your training time.
If you train 200 meters, you can reduce the amount of short-distance accelerated running.
More 150-250 strength. Practice with curves. And curve start technology.
The maximum strength of 400 meters can reach 600, which is basically more than 200-300.
If the ability is limited, it is recommended to run 400 meters at a constant speed.
200 meters is the most important place to bend and cut straight. In that position, you have to push the maximum speed, and you can't throw it off the road and hold it.
400 meters and 200 meters are the same, creatine will accumulate in the back leg muscles. At this time, you can't change your running posture. Try to send your hips.