Women's Swimming 50m Freestyle - Semi-Finals | London 2012 Olympics
Summer Olympic sports: swimming
Competitions begin with preliminary heats. The 24 best swimmers divide 8 people into 3 swims. In the competition at a distance of 400 m, the 8 best swimmers reach the final, and at a distance of 200 m a semi-final is arranged, in which 16 people participate.
Start and finish help identify electronic sensors on the pool walls and pedestals. Therefore, time is calculated to the nearest hundredths of a second.
The Olympic program includes such styles: freestyle, breaststroke, back, and butterfly.
The swim in the freestyle, which is also called the crawl, occurs at distances of 50, 100, 200, 400 and 800 m. In addition, men participate in competitions for a distance of 1.5 km. When swimming as a crawl, the athlete's upper body is constantly above the water surface. A swimmer is allowed to fully submerge under water only at the start and turn, and then to a depth of no more than 15 m. The finish is reached if the participant touched the pool wall with at least one hand.During the turn is allowed to push off with their feet.
When an athlete is on his back, his legs may be under water. He is allowed to go under water at the start and turn to a depth of no more than 15 m. Swimming competitions of this style are held at distances of 100 and 200 m.
The breaststroke swims also pass over a distance of 100 and 200 m. At the same time, the athletes are in a pose with their faces downward and their legs are horizontal and move synchronously. Swimmers can take a vertical position only once with each foot. When turning and finishing, it is imperative to touch the walls of the pool with both hands. The head may be above or above water.
Butterfly style differs from the breaststroke that the swimmer all the time you need to swim face down on the surface of the water. In addition, his hands must move in sync forward.
For swimming competitions, a pool is used which is 50 m long and 3 m deep. It is divided into 8 lanes, which are marked with lines and numbered. Water temperature varies from 25 to 27 degrees.
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Women's Swimming 50m Freestyle - Heats | London 2012 Olympics
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