Freediving Pool Training - Dynamic Apnea, STA, and Session Structure

In open water, variables stack up: current, visibility, swell, boat traffic, water temperature, and the low grade anxiety that comes with all of them. Those variables make it very hard to isolate one thing and improve it. You never quite know whether a bad dive was a bad technique day or simply a bad conditions day.

In a pool you control everything. Depth, distance, timing, rest intervals, and water temperature are all fixed, so the only variable left is you. That is the entire argument for pool freediving. Every lap is measurable against the lap before it, and a 25m or 50m lane gives you a ruler that the ocean never will.

For most freedivers, depth access is seasonal, expensive, or hours away. A pool is usually 20 minutes from home and open six days a week. That accessibility is why serious divers treat dynamic apnea and pool sessions as the base of the training year and depth trips as the expression of that base, not the other way around.

Breath-hold endurance

built through repeated apnea sets with controlled rest

Kick efficiency

measured lap by lap, with distance as immediate feedback

CO2 tolerance

trained safely through structured table work at 1m depth

Rescue confidence

practised with a buddy in warm, clear, controlled water

Technique under fatigue

tested repeatedly without conditions confusing the result

Pool work also transfers directly to depth. A cleaner streamline in the lane means less drag on the descent. Better relaxation during a long dynamic means a calmer freefall. And the CO2 tolerance you build in a lane is exactly the tolerance that keeps you composed on the way back up from 25m.

Dynamic Apnea with Fins (DYN)

The most common pool training discipline. You push off the wall on a breath hold, swim horizontally underwater with long blade fins or a monofin, and surface with margin to spare. Distances are measured in metres and turns are made at each wall, which makes the discipline easy to score and easy to progress.

Key technique points

• Streamlined position, arms along the body or in a narrow streamline ahead
• Slow, relaxed kick cadence, never racing and never thrashing
• Face angled slightly downward so the body stays flat and horizontal
• Neutral or very slightly negative buoyancy so you are not fighting to stay down
• One long glide off the wall before the first kick

Dynamic Apnea Without Fins (DNF)

The same idea as DYN but powered by a breaststroke pull, a glide, and a frog kick, with no equipment at all. Distances are typically 60-70% of your DYN numbers, and the technical demand is much higher. DNF is excellent for body position, undulation, and the arm and core control that carry over into cleaner constant weight diving.

Static Apnea (STA)

Floating face down at the surface, holding your breath for maximum duration. This is the purest form of breath-hold training, with no kick mechanics and no equalization to worry about, just the hold itself. Static is where most people first learn what contractions feel like and how much time actually remains after they begin. The dedicated guide to static apnea covers the mental side of long holds in far more detail.

Rescue and Safety Drills

Every pool session should include some rescue practice, because the pool is the only place you can rehearse it calmly. Practise the blackout recovery sequence: support the airway, remove the mask or nose clip, blow across the eyes, tap the cheek, and talk to the diver. Reviewing the freediving buddy system with a new partner before you train together takes five minutes and changes everything about how safe the session is.

A freediving pool session is not a swim workout with breath holds bolted on. It has a shape: gradual activation, then the hard specific work, then a genuine cool-down. The plan below runs 75 minutes and suits an intermediate diver with a DYN max somewhere between 50m and 75m.

Warm-up (15 min)

• 5 minutes of easy surface swimming to raise body temperature
• 3-4 short dynamic laps of 10-15m at very low intensity to loosen up
• 2-3 face immersion holds of 30-45 seconds to activate the dive reflex
• One easy static of about half your comfortable maximum

Block 1: CO2 focus (20 min)

6-8 dynamic laps at roughly 60% of your maximum distance, with the rest interval shrinking each set from 2:00 down to 0:45. The distance stays the same every time. The goal is to keep your technique and composure identical as CO2 accumulates and the urge to breathe arrives earlier and earlier.

Block 2: Distance focus (20 min)

4-6 dynamic laps at 80-90% of maximum, with full recovery of 4-5 minutes minimum between each. The goal here is quality technique at longer duration, so if your kick falls apart or your turns get sloppy, cut the block short rather than grinding out one more bad rep.

Block 3: Static focus (15 min)

2-4 static holds at near-maximum effort with 4-5 minutes of full recovery between them. Because you are already fatigued from the dynamic work, expect these to be shorter than your fresh numbers. That is normal, and holding well while tired is its own useful adaptation.

Cool-down (10 min)

• Easy surface swimming with no breath holding at all
• Gentle stretching on the wall for the shoulders and hip flexors
• Session log: distances, hold times, rest intervals, when contractions started

Most freedivers plateau because they only ever do one type of dynamic: a maximum attempt, badly rested, once a session. Structured sets fix that. Below are four set formats that cover different adaptations, all built around a personal best you can measure. If your current maximum is unknown, do one relaxed attempt with a buddy at the start of a fresh session and use that number as the baseline.

How to progress distance safely

Add distance in small increments and only when the current distance feels genuinely easy. A useful rule is to hold a distance for three consecutive sessions with clean surfacing and no urge to rush the last metres, then add 5m to 10m. Jumping from 50m to 75m in one week is how people end up sambaing at the wall.

1. 01 —Hold your current working distance for three clean sessions
2. 02 —Add 5-10m and keep the rest interval unchanged
3. 03 —Rebuild comfort at the new distance for two to three sessions
4. 04 —Only then shorten the rest interval or add another 5-10m
5. 05 —Reset to an easier distance after any illness, travel, or two week break

Turns and streamlining

In a 25m pool, half of your distance loss can come from bad turns. A good apnea turn is a tight tuck, a firm push off the wall with the body already streamlined, and a long glide before the first kick. Practise turns as a drill in their own right at low intensity: 6 x 25m with an exaggerated glide off each wall, resting a full 2 minutes between reps.

Streamlining is the cheapest distance you will ever buy. Hands overlapped, arms squeezing the ears, hips high, and no head lift to look forward. Every degree of body angle is drag, and drag costs oxygen. If you are unsure how your technique looks, ask your buddy to film a lap from the deck, since almost nobody swims the way they think they do.

Static in the pool is safer and more measurable than static on the sofa, provided you do it properly. You float face down in shallow water with a buddy holding position beside you, one hand on your shoulder, and an agreed tap signal every 15 or 30 seconds that you must answer with a small finger movement. If a tap goes unanswered, the buddy lifts your face out immediately.

1. 01 —Buddy in position beside you in the water, not on the pool deck
2. 02 —2-3 minutes of normal, relaxed preparatory breathing with no hyperventilation
3. 03 —One full but unforced inhale, then face down and completely still
4. 04 —Buddy taps at agreed intervals and you answer each tap
5. 05 —Surface when you choose to, not when you are forced to
6. 06 —Exhale first, then three recovery breaths, then the OK signal
7. 07 —Minimum 4 minutes of rest before the next hold

A simple static progression

Take your comfortable maximum and work at percentages of it rather than chasing personal bests. A standard set is five holds at 60% of maximum with two minutes of rest, followed by two holds at 85% with five minutes of rest. Over eight weeks that structure moves the contraction point later far more reliably than weekly maximum attempts do.

The preparation phase matters as much as the hold. Slow diaphragmatic breathing, a long relaxed exhale, and a quiet mind for two minutes beforehand will add more time than any physical trick. The breathing techniques used before a hold are the same ones that keep heart rate low during it.

Tables are structured sequences of holds and rests that push one specific adaptation. CO2 tables keep the hold constant and shrink the rest, teaching you to tolerate rising carbon dioxide. O2 tables keep the rest constant and lengthen the hold, teaching you to function at lower oxygen levels. In the pool you can run either as statics or as dynamics, and the dynamic version is considerably harder.

CO2 tables are the safer of the two because the holds stay short and oxygen never drops far. O2 tables carry more risk precisely because they push toward hypoxia, so they belong later in a training block, never at the end of a fatiguing session, and always with a buddy watching every repetition. The dedicated guide to CO2 tables has printable versions you can scale to your own numbers.

Run tables at most two to three times per week and never on consecutive days. They are demanding on the nervous system in a way that does not always feel obvious at the time, and stacking them tends to flatten performance for a fortnight. If your numbers drop across two consecutive sessions, take an easy week rather than adding volume. General breath-hold training principles apply here: adaptation happens during recovery, not during the set.

Two pool sessions plus dry work is enough for steady progress. Three pool sessions suits someone with a competition or a depth trip on the calendar. The table below assumes two in-water sessions and two dry sessions, with a rest day either side of the hardest work.

Keep the two hard pool days separated by at least 48 hours. If life compresses your week, drop the optional Saturday session first and protect the two main ones. Consistency across three months beats a heroic fortnight followed by burnout.

Pool training feels safer than open water. It is not. Blackout can happen in a 25m pool at 1.5m depth, on a lap that felt entirely controlled right up until the last five metres. Warm water, a tiled floor, and a lifeguard chair create a sense of security that the physiology does not share.

• One diver down, one watching, with the buddy in the water or at the wall, never on the deck
• No hyperventilation before any set, ever, in any discipline
• Surface interval at least twice the length of the previous hold or lap
• Brief the lifeguard before you start and tell them what normal looks like
• Recovery breathing every time: exhale first, three full breaths, then the OK signal
• The 30 second surface watch: the buddy stays within arm's reach and watches the diver's face for a full 30 seconds after every attempt
• Agreed hand signals understood by both divers before entering the water
• No weight belt for dynamic unless you are genuinely too buoyant, and never more than a couple of hundred grams of negative

The 30 second surface watch deserves its own emphasis. Most blackouts and samba episodes occur in the first 15 seconds after surfacing, when oxygen in the blood is at its lowest and the diver is upright and talking. Turning away to check a stopwatch during those seconds is the single most common safety failure in club pool sessions.

Talking to the lifeguard

Approach staff before you change, not from the water. Explain that you are doing supervised breath-hold training, that one person is always watching, that the swimmer is never alone, and that if they see someone motionless face down it will be handled instantly by the buddy standing over them. Most refusals come from a lifeguard who has never seen apnea training and reasonably assumes something is wrong. Two minutes of explanation prevents the whistle.

Access is the real bottleneck for most freedivers, not motivation. Very few public pools advertise apnea sessions, but plenty will allow them under the right arrangement. There are four routes worth trying, roughly in order of how easy they are to arrange.

Freediving club sessions

the easiest route, since the club already has the pool agreement, insurance, and trained safety in place

Lane hire

book one or two lanes off-peak, usually cheap and often bookable by an individual or a small group

Scuba club nights

many scuba clubs rent pool time and will happily share a lane with freedivers

Taster sessions

run by schools and clubs as a supervised introduction, ideal for a first pool experience

If you have never trained apnea in a pool before, a supervised introduction is the fastest way in. A freediving taster session typically runs 90 to 120 minutes, covers breathing, a first static, and a first dynamic, and is run under instructor supervision so nothing about safety is left to guesswork.

Questions to ask before booking

• Is breath-hold training permitted, and does that policy come from the manager or the lifeguard on duty?
• What is the shallow end depth, and is the lane length 25m or 50m?
• Can we hire a lane at an off-peak time, and what is the hourly rate?
• Is the water temperature suitable for long statics, or should we bring wetsuits?
• Are long blade fins allowed in the lane, and are there restrictions during public swim?
• Does the facility require proof of certification or club insurance?

Expect to pay lane hire rates rather than a swim entry fee if you want the space to yourself. Splitting a lane between three or four divers keeps the cost low and gives everyone a natural rest interval while the others take their turn.

The same handful of errors show up in nearly every club session. None of them are exotic, and all of them are cheap to fix once someone points them out.

The most expensive mistake on that list is the buddy standing on the deck. A diver who blacks out at 20m into a lap will sink or drift face down, and the difference between a non-event and an emergency is measured in the seconds it takes for someone to reach them.

Track every session in a log. Note distance covered, hold times, rest intervals, when contractions started, and how manageable they felt on a simple scale of one to five. Patterns show up in a log that are invisible in memory, and they usually reveal that the good days follow the sleep, not the effort.

Distances improve

the same rest interval feels easier week over week at the same distance

Contraction point moves later

you get deeper into the hold before the diaphragm starts working

Recovery speeds up

you are genuinely ready for the next set sooner between holds

Technique holds under fatigue

the last lap of a set looks like the first lap of a set

When 80% of your sets feel comfortable, increase intensity by shortening rest, adding distance, or adding hold time. Change one of those three, not all three at once, and give the change two to three sessions to settle before evaluating it.

Progress in apnea is not linear, and plateaus of four to six weeks are completely normal. If numbers stall, the usual culprits are accumulated fatigue, poor sleep, and too many maximum attempts rather than a lack of talent. Drop to an easy technique week, then return to structured sets and the numbers usually move again.

"The pool does not make you a better diver by itself. Repeatable, honest, well rested sets do, and the pool is simply the only place you can do them consistently."