The discus throw is a track and field event in which athletes throw a heavy disc, called a discus in an attempt to throw further than their fellow competitors. It is an acient sport that goes back to Greece 708 BCE. Men's discuses are heavy discs with a weight of 4.4 pounds and a diameter of 8.7 inches. Women's disuses are 2.2 pounds and have a diameter of 7.1 inches. Typical discuses are made of plastic, wood, fiberglass, carbon fiber, or metal with a metal rim and core to attain the weight. To make a throw the athlete starts in a circle of 8 ft 2.25 inches diameter. The thrower typically takes an inital stance facing away from the direction of the throw and spins around to build momentum, then releases his throw. The discus must land in the cone in front of the thrower on the ground in order to count as a legal throw, if the thrower ever leaves the circle during or right after the discus is thrown, the throw is disqualified.