That runway is easy to run in the 400-meter race.

Lines 3, 4, 5 and 6 are easier to run. These four lanes are all golden lanes, and the turning radius is not too big, which is suitable for running in corners. Right in the middle of the runway, you can see the people around you out of the corner of your eye. Turbulence and crosswinds are rarely beneficial to running, especially in lanes 4 and 5. However, the number of people who pass the preliminaries is generally determined by drawing lots, and then the rematch, semi-final and final are arranged according to the results of the previous round (ranking of each group). The corresponding relationship between grades and passing times is 1, 2, 3, 4, 5, 6, 7, 8, corresponding to 4, 5, 3, 6, 2, 7 respectively.