Freediving, free-diving, or free diving is a form of underwater diving that relies on divers' ability to hold their breath until resurfacing rather than on the use of a breathing apparatus such as scuba gear. Recognised examples of freediving activities include traditional fishing techniques, competitive and non-competitive freediving, competitive and non-competitive spearfishing and freediving photography, synchronized swimming, underwater football, underwater rugby, underwater hockey, underwater hunting other than spearfishing, underwater target shooting and snorkeling. The term 'freediving' is often associated with competitive breath-hold diving or competitive apnea. However, while some regard freediving as a specific group of underwater activities, for others it is merely a synonym for breath-hold diving. The activity that attracts the most public attention is the extreme sport of competitive apnea in which competitors attempt to attain great depths, times, or distances on a single breath.