Yo-yo, also known as yo-yo, is a sport. Yo-Yo (YO-YO), according to legend, in the 16th century, the Philippines, the hunting nation in the hunting and fighting use of implements, in the front end of the rope hanging weights like yo-yo weapons.

Can prevent myopia: yo-yo in the process of playing up and down swing, the player watching the yo-yo can make the lens with the yo-yo near and far and zoom contraction, thus greatly reducing the possibility of myopia; improve attention: in the play of yo-yo players must be highly concentrated attention to yo-yo accurately hitched on the top of a small rope.