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 mode 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 breat ...
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 by competitive swimmers during entry and turns, and as part of the butterfly stroke.
Description
The dolphin kick is named for its resemblance to the motions made by ...
; 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 ...
(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: 125 m
* Person:
Alexey Molchanov
* Date: 2024-09-10
* Location:
Ajaccio
Ajaccio (, , ; French language, French: ; or ; , locally: ; ) is the capital and largest city of Corsica, France. It forms a communes of France, French commune, prefecture of the Departments of France, department of Corse-du-Sud, and head o ...
, France, 33rd AIDA Freediving World Championships, 2024
Women
* Depth: 113 m
* Person:
Alessia Zecchini
Alessia Zecchini (born 30 June 1992) is an Italian freediver who has set world and Italian records in freediving.
At the age of 13, Zecchini completed her first federal apnea course in A.s.d. "Apnea Blu Mare". In 2009 she changed clubs and b ...
* Date: 2025
* Location:
Moalboal
Moalboal (), officially the Municipality of Moalboal (; ), is a municipality in the Philippine province of Cebu. According to the 2020 census, it had a population of 36,930 people.
Pescador Island, a popular tourist attraction, is part of th ...
, Philippines, 2023
References
{{Underwater diving, frediv
Competitive apnea disciplines