Freestyle footbag, also known as freestyle hacky sack, is a sport wherein players pass around a small bag using their feet and various parts of their bodies, performing tricks and sequences. It is a popular recreational activity that tests a player's coordination, agility, and creativity. Synonyms for freestyle footbag can include hacky sack, footbag, shuttlecock, and Jianzi. Hacky sack is a term coined by the Wham-O toy company, which marketed the product in the late 1970s. Footbag is a broader term used to describe different types of activities involving kicking a bag. Shuttlecock and Jianzi are Chinese sports that also involve keeping an object off the ground using kicks and other techniques.