Traditional bows include long bows and recurve bows. All bow types may compete (longbows, recurve, barebow and compound). Recurve archery is the only discipline of archery featured at the Olympic Games. The invaders used composite bows as well as improved recurve bows and arrowheads. Straight and recurve are considered traditional bows. An important distinction arrow-wise between recurve bows and compound bows is that of arrow spine. These developed into the powerful composite and recurve bows, and crossbows of Ancient China. They had mastered the difficult art of shooting composite recurve bows from horseback. The Perso-Parthian bow is a symmetric recurve under high tension when strung. Most modern recurve bows are built with some degree of deflex. All-American honors are awarded for Olympic Recurve, Compound Target, and Bowhunter divisions. The knife has a distinct recurve in the blade. She won gold medal in the 2010 Commonwealth games in the women's individual recurve event. However, most fall into three main categories&colon; straight, recurve and compound. Shortly after peaking, the storm began to recurve towards the northeast and weaken.