The tug-of-war is the traditional collective test of strength athletics project, is in fashion the nation. According to "Mozi Lu Asked" and "Jingchu Year old Time mark" 杜公 gazes the note to introduce, this kind of athletics source gets up the Spring and Autumn Period later period, at that time between Chu, Wu carried on the aquatic boat war, Chu country invites the Lu country''s name artisan which Chu travelled for pleasure 公输 for it to design a specific name is '''''''''''''''' the hook strong '''''''''''''''' appliance, occupied the superiority at the boat war in the situation to be allowed to use it to cancel the enemy boat, did not let it escape, when unfavorable situation was allowed to use it to resist the enemy boat, did not let it approach, in order to avoid was captured. Operation manual: Crazily presses the space bar, persisted, only then wins