How to measure your static apnea personal best, reliably

Ask ten freedivers for their static personal best and most will give you a number. Ask how they measured it and the answers get vague. One was tested after lunch, another first thing in the morning, a third right after a CO2 table. Some warmed up, some did not. Those numbers are not wrong, but they are hard to compare, even with themselves a month later.

That matters because your personal best does more than measure progress. It is the input to your training: table holds, recoveries and plan intensity are all calculated from it. A test that is clean and repeatable gives you a number you can trust, and tables that fit. This guide lays out a protocol you can run at home, dry, in about twenty-five minutes.

Why a clean, repeatable test matters

A maximal static hold is not a fixed property like your height. It depends on lung volume, metabolic rate, the diving response and your tolerance to rising CO₂ and falling oxygen¹, and several of those shift from day to day. Relaxation plays a large part too: tension in the jaw, shoulders or hands burns oxygen and makes the discomfort feel stronger.

So a test answers two questions at once: how far you can go, and how far you can go today, in these conditions. You cannot remove the second part, but you can keep it constant. When the conditions are the same, the difference between two tests mostly reflects your training. When they change, you are measuring your sleep, your lunch or your stress level.

There is also a practical reason. If your personal best is overestimated, every table built on it will be too hard, sessions will fall apart in the middle rounds, and you will conclude you are not progressing. If it is underestimated, tables will be too easy to drive adaptation. The effect is shown concretely further down.

Set up the conditions

Before the protocol itself, fix the variables you control. Write them down the first time, then reproduce them for every test.

• Time of day. Pick a slot you can repeat, such as late morning or early evening, and keep it. Results at 7 a.m. and 7 p.m. are not directly comparable.
• Digestion. Test on a light stomach, roughly two to three hours after a meal. A full stomach pushes on the diaphragm and makes the hold uncomfortable much earlier.
• Sleep and fatigue. Test on a normal day after a normal night. If you slept badly or trained hard the day before, postpone.
• Temperature. Be comfortably warm. Shivering or cold hands increase energy use and make it harder to relax. Have a blanket at hand, because you cool down while lying still.
• Position. Lie on your back on a bed, sofa or mat, arms by your sides, in a quiet room. Lying down is both the most relaxed position and the safest one.
• Face and water. Cooling the face, for example with cold water, strengthens the diving reflex². Either never do it, or always do it the same way. Mixing the two makes tests incomparable.

The test protocol, step by step

The structure is simple: settle, prepare with a few easy holds, breathe calmly, attempt, recover. Here is how it unfolds for someone whose previous best is around 3:00. Scale the warm-up holds to your own number.

1. Settle for 4 to 5 minutesLie down, close your eyes and breathe slowly through the nose, with an exhale longer than the inhale. Let your heart rate come down. Set up your timer now so you do not have to move later.
2. Warm-up hold 1: about a third of your bestA very easy hold, with no discomfort at all. Then two minutes of calm breathing.
3. Warm-up hold 2: about half of your bestStill comfortable. You may feel the first urge to breathe near the end. Then two to three minutes of recovery.
4. Optional warm-up hold 3: about two thirdsStop at or just before the first contractions. This is preparation, not a second test. Skip it if the first two already felt demanding.
5. Breathe-up: two minutes of calm breathingSlow, relaxed, belly first. No fast or deep breathing, no attempts to "load up". Finish with a full but unforced inhale, around 85 to 90 % of your capacity.
6. The attemptStart the timer, stay still and scan the body from the jaw down to the feet. Note when the first contraction arrives. Let contractions pass rather than fighting them, and end the hold calmly, before you feel any dizziness or tingling.
7. Recovery breathingExhale only a little, inhale quickly and fully, hold for one or two seconds with slight pressure, and repeat two or three times. Stay lying down for a few minutes.

Why warm up at all? Preparatory holds are standard practice in static apnea, and repeated holds are associated with a stronger diving response and contraction of the spleen, which releases extra red blood cells into circulation¹. Just as important, the warm-ups get you mentally settled and give you a feel for the day. If warm-up 2 is already unusually hard, that is useful information: postpone the test.

The first contraction marks the end of the easy phase and the start of the struggle phase³. Recording it during the test is valuable, because it is a second, steadier marker next to the total time. If you use the Anima Apnea static timer, a single tap marks each contraction and the first one is saved automatically with the hold.

What to log after the test

A number without context is half a measurement. Right after the test, while you still remember, write down:

• Total hold time and first-contraction time, and roughly how many contractions you had;
• the conditions: date and time, hours since your last meal, sleep quality, room temperature;
• the warm-up you did, with the duration of each hold;
• how the attempt ended: a calm, chosen exit, or a forced one because the urge became too strong;
• anything unusual: stress, noise, a cold, any symptom during or after the hold.

Over a few tests, this record shows you which conditions suit you and lets you spot a test that should not count. It is also what turns a pile of numbers into a trend, a habit discussed in more detail in training static apnea without a coach.

How often to retest, and why results vary

Retest every two to four weeks. Adaptation to breath-hold training is gradual, so testing every few days mostly measures noise. Maximal attempts are also tiring and mentally loaded: they belong at the end of a lighter week, when you are fresh. The training plans in Anima Apnea follow this rhythm, with record attempts at the end of weeks 2 and 4 of each four-week block.

Even with a careful protocol, expect your results to move. A bad night, a stressful day, a slightly heavier lunch or simply a less relaxed state of mind can cost you noticeably on a maximal hold. That is why one test is a data point, not a verdict.

A useful rule: keep the number you train from unchanged until a clean test beats it, or until two clean tests in a row come in clearly lower. That protects you from chasing one lucky day or overreacting to one bad one.

From your personal best to your tables

Here is where the quality of the test pays off. A CO2 table holds for about half your best and starts with a recovery of about two thirds of it, then shortens that recovery by 15 seconds each round. With a best of 3:00, that gives the table below.

Move the slider to see how the whole table shifts with the number you enter:

Now compare what happens when the test is off. The table below shows the same rules applied to a best measured on a poor day, a clean test, and an inflated number from an exceptional day.

Thirty seconds of error in the test turns into fifteen seconds on every hold, eight times in a row. With the inflated number, the table is likely to break down around the middle rounds; with the low one, the last rounds stay comfortable and the stimulus fades. The same logic applies to an O2 table, whose longest holds approach your maximum.

Safety during a max attempt

A personal-best test is the session where you go closest to your limit, so it deserves the strictest rules.

• Never hyperventilate. Fast, deep breathing lowers CO₂ and delays the urge to breathe without adding meaningful oxygen. It removes your warning signal, which is the classic path to blackout⁴.
• End the hold at the first sign of dizziness, tingling in the lips or hands, visual changes or anything unusual. A record is never worth it.
• Stay lying down after the attempt until your breathing is fully back to normal.
• Never test while driving, standing, in the bath, or anywhere a loss of consciousness would be dangerous.
• Get medical advice first if you have a heart or lung condition, epilepsy, or are pregnant.

If someone else is at home, let them know what you are doing. A partner who simply watches a dry max attempt is a sensible extra margin. To take your static into the pool, take a certified course (AIDA, Molchanovs, SSI, PADI Freediver) or join a club first.

Frequently asked questions