Constant weight bi-fins, denoted by the acronym CWTB in competition notation, is a competitive

freediving Freediving, free-diving, free diving, breath-hold diving, or skin diving is a form of underwater diving that relies on breath-holding until resurfacing rather than the use of breathing apparatus such as scuba gear. Besides the limits of breath-h ...

discipline wherein the freediver wears a pair of bi-fins (or stereo, as opposed to a monofin) to descend along the line with or without the use of their arms. Pulling on the rope or changing ballast will result in disqualification; only a single hold of the rope is allowed in order to turn and stop the descent and start the ascent. The diver is prohibited from using a

dolphin kick The dolphin kick is a kicking movement used in swimming. It is frequently used as part of the butterfly stroke and in underwater kicking. See also * Fish kick The fish kick is a method of kicking while swimming, generally used underwater. It ...

; doing so will result in disqualification of the day's dive. For

AIDA International Association Internationale pour le Développement de l'Apnée (AIDA) (English: ''International Association for the Development of Apnea'') is a worldwide rule- and record-keeping body for competitive breath holding events, also known as freedivi ...

officiated freediving competitions, bi-fins was previously included under the umbrella term of

constant weight Constant weight (CWT) is a freediving discipline recognised by AIDA, the International Association for the Development of Apnea, in which the freediver descends and ascends using their monofin and/or with the use of their arms without pulling on th ...

(CWT) in competition. Prior to 2019, competitors wanting to use bi-fins in competition would compete under the category of constant weight alongside those using a monofin. In 2019, AIDA formally separated Constant Weight Apnea with Bi-fins (CWTB) into its own category for competition. Following the rule changes, national record and world record titles could now be earned for the category of CWTB. For CMAS officiated freediving competitions, bi-fins has been recognized as a competitive category separate to constant weight (with a monofin), with officiated records for bi-fins starting as early as 2015.

Current world record holders in CWTB

Men

* Depth: 122 m * Person: Arnaud Jerald * Date: 2023-07-20 * Location:

Dean's Blue Hole __NOTOC__ Dean's Blue Hole is a blue hole located in The Bahamas in a bay west of Clarence Town on Long Island and is the world's second deepest, after the Dragon Hole in the South China Sea, with a depth of . Formation A blue hole is a water ...

, Bahamas,

Vertical Blue Vertical Blue is a freediving competition which has been held annually in The Bahamas at Dean's Blue Hole since April 2008 by freediving world record holder William Trubridge. It is an AIDA International or CMAS in 2021 judged competition and ha ...

, 2023

Women

* Depth: 109 m * Person:

Alessia Zecchini Alessia Zecchini (born 1992) is an Italian freediver who set world and Italian records in freediving. At the age of 13, she completed her first federal apnea course in A.s.d. "Apnea Blu Mare". In 2009 she changed clubs and became an athlete of ...

* Date: 2023-03-29 * Location:

Moalboal Moalboal, officially the Municipality of Moalboal ( ceb, Lungsod sa Moalboal; tgl, Bayan ng Moalboal), is a 4th class municipality in the province of Cebu, Philippines. According to the 2020 census, it has a population of 36,930 people. Exten ...

, Philippines, 2023

References

{{Underwater diving, frediv Competitive apnea disciplines