This achievement is not very slow, it should be in the top 20% of all college students. 400 attaches importance to anaerobic endurance and explosive power, so when practicing, on the one hand, we should practice speed, such as accelerating 30 meters and accelerating 60 meters, on the other hand, we should practice variable speed running (such as running 300 meters fast, jogging 100 meters, running at 90% of our fastest speed when fast, jogging means relaxing and running 10 laps regardless of time), and on the other hand, we should increase flexibility.