Freediving
Disciplines
Competitive freediving is organised into eight disciplines by AIDA International — four depth events and four pool events. Each tests a different facet of breath-hold performance.
Depth Disciplines
Depth disciplines measure how deep a freediver can descend and return in open water on a single breath, along a vertical guide rope.
Constant Weight
The most prestigious depth discipline and the one used in the World Championships. The freediver descends and ascends using fins and/or arm movements, but may not change the weight they carry — no dropping weights, no pulling on the rope. A single stroke on the rope is permitted at the bottom to initiate ascent.
Technique
Strong monofin or bifin technique is critical. Descent uses a streamlined head-down position; ascent requires active finning or swimming. Mouthfill equalization is essential beyond 30m. Good CWT freedivers have mastered negative buoyancy at depth and positive buoyancy near the surface.
Indian National Records
Key Skills
- arrow_rightMonofin / bifin technique
- arrow_rightMouthfill equalization
- arrow_rightFreefall phase
- arrow_rightEfficient kick cycle
Constant Weight No-Fins
Widely considered the purest form of freediving. No fins, no rope pulling — the diver descends and ascends using only body movement and breaststroke-style arm pulls. CNF demands exceptional technique, relaxation, and physical efficiency. Many regard a 50m CNF dive as equivalent to a 100m+ CWT in terms of physical and mental challenge.
Technique
The descent relies on a streamlined dolphin undulation or modified breaststroke. Ascent requires powerful pulls through increasingly dense water. Hydrodynamic body position is everything — excess drag at depth is catastrophic. Freediver must be fully comfortable with the mammalian dive reflex and complete relaxation at depth.
Indian National Records
Key Skills
- arrow_rightBody undulation
- arrow_rightDrag minimisation
- arrow_rightUpper body strength
- arrow_rightFull-body relaxation
Free Immersion
The diver pulls themselves hand-over-hand down and back up the dive rope, using no fins. FIM is often used for training other disciplines because it conserves leg energy, allows focus on equalization, and gets the diver comfortable at depth. It's also used by athletes recovering from injuries or exploring a new depth target.
Technique
Efficient hand-over-hand pulling on descent and ascent, with body horizontal to reduce drag. Mask pressure equalization and mouthfill are still required at depth. FIM allows the diver to stop and equalise at any point, making it more accessible than CWT for learning mouthfill technique at new depths.
Indian National Records
Key Skills
- arrow_rightRope technique
- arrow_rightEqualization focus
- arrow_rightBody positioning
- arrow_rightArm strength
Constant Weight Bifins
A depth discipline identical to CWT but specifically using bifins (two separate fins, one on each foot) rather than a monofin. CWTB has its own separate records from CWT. Bifins are more accessible and closer to recreational diving equipment, making this discipline popular with newcomers to competitive freediving.
Technique
The flutter kick used in CWTB is less hydrodynamically efficient than the dolphin kick of a monofin, but is more natural for most freedivers and easier to master. Head position, arm streamlining, and kick frequency are the main variables. Most entry-level freedivers develop their technique in CWTB before transitioning to monofin.
Indian National Records
Key Skills
- arrow_rightFlutter kick technique
- arrow_rightStreamlining
- arrow_rightMouthfill basics
- arrow_rightDescent angle
Pool Disciplines
Pool disciplines are conducted in a standard swimming pool and measure either maximum time (STA) or maximum distance (DYN, DYNB, DNF) on a single breath.
Static Apnea
The diver floats face-down in a pool, completely still, holding their breath for as long as possible. No movement, no depth — just time. STA tests the limits of human hypoxia tolerance and CO₂ resistance. The world record is over 24 minutes. STA is the discipline most directly linked to breathwork training and mental conditioning.
Technique
Total body relaxation is the only technique. Diaphragmatic breathing before the attempt, a pre-dive recovery phase, then absolute stillness. The diver must resist the contractions that signal CO₂ buildup without hyperventilating. Mental training — visualization, meditation — is as important as physical conditioning. Top STA athletes train daily for years.
Indian National Records
Key Skills
- arrow_rightBreathwork
- arrow_rightCO₂ tolerance
- arrow_rightFull-body relaxation
- arrow_rightMental conditioning
Dynamic Apnea
The diver swims horizontally through the pool underwater for as far as possible on a single breath, using a monofin. DYN is a distance discipline — typically conducted in a 25m or 50m pool. It combines the streamlined technique of CWT with the CO₂ tolerance demanded by STA. World records are well above 300m.
Technique
Monofin dolphin kick efficiency is paramount. The diver uses a hydrodynamic body position just below the surface. Turn technique at the pool wall is a significant differentiating skill. Pacing — not sprinting — determines whether the diver finishes or surfaces early. Most elite DYN athletes train on CO₂ tables before switching to distance sets.
Indian National Records
Key Skills
- arrow_rightMonofin efficiency
- arrow_rightPool turns
- arrow_rightPacing strategy
- arrow_rightStreamlined position
Dynamic Apnea Bifins
Identical to DYN but performed with bifins instead of a monofin. DYNB is the most accessible competitive discipline and a natural entry point for anyone transitioning from recreational freediving to competition. The distance records are typically shorter than DYN, but the discipline rewards good kick technique and efficient breathing strategy.
Technique
A steady, relaxed flutter kick — not fast, but consistent. The diver maintains a shallow depth (0.5–1m below the surface) to avoid pressure losses. Good wall turns and a calm, unhurried pace outperform speed-focused attempts. DYNB is excellent for building CO₂ tolerance tables in a training context.
Indian National Records
Key Skills
- arrow_rightFlutter kick consistency
- arrow_rightRelaxed pace
- arrow_rightShallow depth
- arrow_rightCO₂ tolerance
Dynamic No-Fins
The diver swims horizontally through the pool underwater for maximum distance using only breaststroke — no fins of any kind. DNF is one of the most physically demanding disciplines. The energy cost of swimming without fins is high, and maintaining a horizontal position and streamlined pull requires significant upper body conditioning.
Technique
A wide, powerful breaststroke with a tight glide phase. Body position must be horizontal — any downward angle wastes distance. Glide duration after each stroke is a critical decision: too long and momentum dies, too short and oxygen burns too fast. Elite DNF freedivers typically complete 10–14 strokes per length at competition pace.
Indian National Records
Key Skills
- arrow_rightBreaststroke technique
- arrow_rightGlide phase timing
- arrow_rightUpper body power
- arrow_rightBody position
Indian National Records at a Glance
| Discipline | Category | Women | Men |
|---|---|---|---|
| CWTConstant Weight | Depth | 45mArchana Thiagarajan | 73mBux Khurana |
| CNFConstant Weight No-Fins | Depth | 36mArchana Thiagarajan | 45mBux Khurana |
| FIMFree Immersion | Depth | 45mArchana Thiagarajan | 50mBux Khurana / Shubham Pandey |
| CWTBConstant Weight Bifins | Depth | 43mArchana Thiagarajan | 72mBux Khurana |
| STAStatic Apnea | Pool | 4:22Archana Thiagarajan | 5:16Akshay Thatte |
| DYNDynamic Apnea | Pool | 125mArchana Thiagarajan | 128mAkshay Thatte |
| DYNBDynamic Apnea Bifins | Pool | 137mArchana Thiagarajan | 129mAdib Nagarajan |
| DNFDynamic No-Fins | Pool | 94mArchana Thiagarajan | 112mHarshvardhan J. |
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