The 200m is half way around the track.
#2 -
The inside lane of a standard running track is 400 meters, with the finish line of the 200 meter race at the end of the front straightaway, and the starting point at the end of the back straightaway. All runners in the 200 cover the same distance -- an 84.4-meter curve and a 115.6-meter straightaway (= 200 meters).
While all the lanes in both straightaways are equal length, the further outside you go on the turns, the longer the distance around the track, due to the wider radius. In order to allow all runners to end at the same finish line, the starting points for any race running around a curve must be measured the appropriate distance away from the finish, which explains the need for "staggered" starts, preventing runners from using one single starting line.
If you look at a 400-meter race, which is one full lap for the runner in the inside lane, the stagger between the starting blocks for other lanes will be double the stagger for the 200. The outermost athlete is near the end of the first turn, which makes it appear they only have one curve with which to contend. However, while the innermost lane does in fact run two separate curves, the outermost lane runs one much-longer one. So, regardless of lane assignment, all athletes still run identical distances on both straights and curves.
If there is a major difference in lane choice, it is that some athletes do not like to run the "tight" curve of the inner lanes, preferring the gentle curve of the outer lanes. On the other hand, the runners in the outer lanes cannot easily "keep an eye" on the other competitors, and often prefer to be toward the middle lanes, where the curve is moderately sharp, but they can still see half of the competitors.
Chat with our AI personalities