Discus throw - Info
The Discus throw is an athletic throwing event in track and field. The discus, the object to be thrown, is a heavy lenticular disc with a diameter of 220 mm (8.66 inches) and weight of two kg (4 lb 7 oz) for the men's event, and one kg (2 lb 3 oz) for the women's, with a smaller diameter of 182 mm (7.17 inches). In US high school track and field, boys typically throw a discus weighing 1.616 kg (3 lb 9 oz) and girls throw the 1 kg (2.2 lb) women's disc. The discus usually has sides made of rubber, plastic, wood, or metal with a metal rim and a metal core to attain the weight. Discus with more weight in the rim produce greater angular momentum for any given spin rate, and thus more stability, although they are more difficult to throw. A practice discus made of solid rubber is often used in high school; it is cheaper, more durable, and easier to learn to throw.

The basic motion is a forehanded sidearm movement. The discus is spun off the index finger or middle finger of the throwing hand, spinning clockwise when viewed above for a right handed thrower, and vice-versa. As well as achieving maximum momentum in the discus on throwing, the discus's distance is also determined by the trajectory the thrower imparts, as well as the aerodynamic behaviour of the discus. Generally, one wishes to throw to a moderate headwind to achieve maximum throws. Also, a faster-spinning discus imparts greater gyroscopic stability. The technique of discus throwing is quite difficult to master and needs lots of experience to get right, thus most top throwers are thirty years old or older.

It is a sport in the Decathlon