Angular momentum, which is also called rotary momentum, is a mechanical factor in discus throwing that basically describes how fast the thrower+discus system is rotating. Changes in the angular momentum of the system can occur only when forces are exerted at a point off center of mass.
Techniques for Track and Field & Cross Country
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Maheras, A. (2011). The Function of the Extremities in Discus Throwing. Techniques for Track and Field & Cross Country, 4 (4), 8-16.