Chinese Foot Bag: "Jianzi"

The shuttlecock, called a jianzi in the Chinese game and also known in English as a 'Chinese hacky sack' or 'kinja', typically has four feathers fixed into a rubber sole or plastic discs. Some handmade jianzis make use of a washer or a coin with a hole in the center. During play, various parts of the body, but not the hands, are used to keep the shuttlecock from touching the ground. It is primarily balanced and propelled upwards using parts of the leg, especially the feet. In China, the sport usually has 2 playing forms: Circle Kick among 5-10 peoples, and Duel Kick between 2 kickers. Circle Kick uses upward kicks only for keeping the shuttlecock from not touching ground. Duel Kick is very popular recently among Chinese young players and is more of a competitive sport.
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Source: http://en.wikipedia.org/wiki/Jianzi