To participate in the discus throw, the athlete throws a metal disc as far as possible into a specified region without ever stepping outside of a circle that is 2.5 meters in diameter. Men throw a 2 kg disc, whereas women throw a 1kg disc.
The thrower begins standing stationary within the 2.5-meter throwing pad, and then performs the throwing motion, typically doing one and a half turns within the circle. After release, the thrower must remain in the circle until the disc lands, and then he must leave via the rear of the circle.
The disc must land within a sector defined by a 40 degree angle from the front of the throwing circle. Discs that land outside this area are considered fouls, and the thrower does not receive credit for their distance.
Discus throws are judged based on the distance the disc travels in the air. In most competitions, judges determine where the discus first makes contact with the ground and use this point to measure the distance of the throw. The distance is measured in a straight line from the throwing circle, so it doesn't matter if the discus flies directly straight or toward the sides of the circle, as long as it lands within the 40-degree sector.
As of 2014, the world record for the discus throw is 74.08 meters, accomplished by Jürgen Schult in 1986.