A Complete Guide to Every Competitive Category
Freediving is not one single sport.
It is a collection of disciplines — each testing a different aspect of human ability.
Some disciplines measure depth.
Others measure time.
Others measure distance.
Some reward power.
Others reward efficiency.
All reward composure.
Understanding the disciplines is essential to understanding competitive freediving.
What Is a Freediving Discipline?
A discipline is a specific competitive category with defined rules.
Each discipline determines:
How the diver moves
What equipment is allowed
Whether the dive is vertical or horizontal
What performance is measured
Modern competitive freediving is governed internationally by organizations such as:
Each federation defines discipline standards, safety requirements, and record validation.
Two Main Categories
Freediving disciplines fall into two broad groups:
Depth Disciplines (Open Water)
Pool Disciplines
They test different systems.
Depth Disciplines
Depth disciplines involve descending vertically along a line in open water.
The diver announces a target depth before the dive.
Performance is measured by:
Depth reached
Proper surface protocol
Safety compliance
Pressure increases rapidly with depth.
These disciplines require equalization and pressure adaptation.
1. Constant Weight (CWT)
Constant Weight is the most recognized depth discipline.
The diver:
Descends and ascends using fins
Cannot pull on the line
Cannot change weight during the dive
CWT demands:
Efficient fin technique
Calm descent
Controlled ascent pacing
2. Constant Weight Bi-Fins (CWTB)
CWTB follows the same rules as CWT — but requires bi-fins instead of a monofin.
Bi-fins:
Require alternating leg movement
Emphasize symmetry and efficiency
Often feel more natural to beginners
3. Free Immersion (FIM)
In Free Immersion, the diver:
Pulls down and up the line using arm strength
Uses no fins
Must remain in constant contact with the rope
FIM is often taught early because:
It allows slower, controlled descent
Equalization timing is easier to manage
Movement is deliberate and rhythmic
4. Constant Weight No Fins (CNF)
CNF is considered by many to be the most physically demanding discipline.
The diver:
Uses no fins
Does not pull on the rope
Relies entirely on swimming power
Efficiency becomes critical.
Small technical errors cost oxygen quickly.
CNF is respected for its purity.
Pool Disciplines
Pool disciplines remove pressure from the equation.
There is no depth compression.
Instead, performance is determined by oxygen management and efficiency.
1. Static Apnea (STA)
Static apnea measures:
The longest breath-hold duration
The diver floats face-down in a pool, supported by a safety diver.
This discipline tests:
Mental control
CO₂ tolerance
Relaxation
Contractions are intense.
Stillness is essential.
2. Dynamic Apnea (DYN)
Dynamic apnea measures:
Horizontal distance underwater
DYN typically uses a monofin.
The diver swims underwater in a pool for maximum distance.
Streamlining and technique dominate.
3. Dynamic Bi-Fins (DYNB)
DYNB follows the same structure as DYN but uses bi-fins.
Movement differs significantly from monofin technique.
Efficiency and rhythm are key.
4. Dynamic No Fins (DNF)
Dynamic No Fins measures horizontal distance underwater in a pool without fins. The diver uses underwater breaststroke-style technique and streamlining to maximize efficiency.
DNF tests:
Technique efficiency (glide timing + stroke quality)
CO₂ tolerance and mental control
Oxygen economy under sustained effort
It’s often considered the “pool version” of CNF in terms of purity and physical demand — no fin propulsion, no shortcuts, just efficient movement.
How Disciplines Differ Physiologically
Depth disciplines stress:
Pressure adaptation
Equalization skill
Lung compression
Ascent oxygen management
Pool disciplines stress:
Oxygen efficiency
CO₂ tolerance
Streamlining
For the science behind these differences:
→ CO₂ vs O₂ in Freediving
→ Boyle’s Law in Freediving
→ Mammalian Dive Reflex Explained
Which Discipline Is Best for Beginners?
Many beginners start with:
Static apnea (STA)
Free Immersion (FIM)
These allow controlled skill development.
Constant Weight often becomes the long-term focus.
Some athletes specialize.
Others compete across multiple disciplines.
How Records Are Set
In competition:
Divers announce a target
Judges verify performance
Surface protocol confirms consciousness
Safety teams monitor every dive
Record recognition is governed by federations like AIDA International and CMAS.
White cards indicate valid dives.
Yellow cards indicate the diver did not meet the announced depth, time (static) or length (pool).
Red cards indicate rule violations or safety failures.
Records are not casual achievements.
They are formally ratified.
The Philosophy of Discipline
Each discipline teaches something different.
Depth disciplines teach surrender.
Static teaches patience.
CNF teaches efficiency.
FIM teaches control.
Dynamic teaches rhythm.
The discipline you choose often reflects your personality.
But all of them train peace in pressure.
Explore Each Discipline in Detail
→ Constant Weight (CWT) Explained
→ Constant Weight Bi-Fins (CWTB) Explained
→ Free Immersion (FIM) Explained
→ Constant Weight No Fins (CNF) Explained
→ Static Apnea (STA) Explained
→ Dynamic Apnea (DYN) Explained
→ Dynamic Bi-Fins (DYNB) Explained
→ Dynamic Np Fins (DNF) Explained
→ View Current World Records