Freediving, free-diving, or free diving is a form of underwater diving that relies on a diver’s ability to hold his or her breath until resurfacing rather than on the use of a breathing apparatus such as scuba gear. Recognized examples of freediving activities include traditional fishing techniques, competitive and non-competitive freediving, competitive and non-competitive spearfishing and freediving photography. Less recognized examples include, but are not limited to, synchronized swimming, 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.
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.