Author: ALFC Team
Most freedivers can remember their personal best. Ask them about the deepest dive they've ever done, and they'll probably give you the exact number, the location and maybe even the date. Some will remember the water temperature, the conditions and how they felt during the descent. But ask them about the ten dives they did before that personal best, and things become a little less clear. How many attempts did it take? What changed between sessions? Were they consistently comfortable at that depth, or was it simply one particularly good day?
This is where keeping a dive logbook becomes interesting. Not because every dive needs to be documented like an important scientific experiment, but because our memories are surprisingly selective. We tend to remember the exceptional dives, the frustrating ones and the moments when something unusual happened. The ordinary sessions, where we practise, make small adjustments and gradually improve, often disappear from memory within a few weeks.
And yet those ordinary sessions are usually where most of our progress happens.
A dive logbook gives you a way to look back at your training without relying entirely on what you think happened. It doesn't need to be complicated. You don't need expensive software, detailed spreadsheets or an obsession with statistics. A simple notebook can be enough. What matters is recording information that helps you understand your diving, recognize patterns and make better decisions about your training.
At ALFC, we encourage freedivers to think beyond individual performances. A successful training session isn't necessarily the one where you reached your greatest depth. Sometimes it's the session where you finally understood a technical problem, became more consistent or recognized that you needed to change your approach. Keeping a logbook makes those developments easier to recognize, particularly when they happen gradually.
And perhaps most importantly, it gives you a more accurate picture of the freediver you're becoming.
Your Memory Is Not A Particularly Reliable Training Tool
There's a good reason why athletes in so many sports keep training records. Human memory isn't designed to preserve every detail of every session, and it becomes even less reliable when emotions are involved. We remember experiences partly according to how they made us feel, which means our recollection of a training period can be quite different from what actually happened.
Imagine you've spent two weeks training depth. You arrived hoping to improve your personal best, but things didn't go exactly as planned. You struggled with equalization during several sessions, felt tired on a few mornings and eventually decided not to attempt the depth you'd originally targeted. When somebody asks how the trip went, you might describe it as disappointing.
But if you'd kept a logbook, you might see something quite different.
Perhaps your average descent technique improved. Maybe you became more consistent at depths that previously required considerable effort. You might notice that your recovery between dives became more comfortable, that your equalization improved at certain stages of the descent or that you were able to complete more technically controlled dives without unnecessary effort.
None of those improvements would necessarily stand out in your memory because they weren't associated with a dramatic achievement. But together, they might represent meaningful progress.
The opposite can happen too. You might remember a training period as particularly successful because you achieved a new personal best. Looking at your records, however, you might discover that most of the surrounding sessions were inconsistent, that you frequently struggled with technique or that you were regularly finishing training feeling exhausted.
That doesn't make the personal best any less real. It simply gives you a more complete picture.
A logbook helps separate individual achievements from overall development.
It can also reveal how often we repeat the same mistakes. Perhaps you regularly begin training too aggressively after several days away from the water. Maybe your equalization becomes less reliable when you're tired, or you tend to struggle during sessions where you've rushed your preparation.
Without written records, these experiences can feel like unrelated incidents. With a logbook, patterns become easier to recognize.
Of course, a logbook isn't automatically objective. The information you record still depends on your observations, and those observations can be influenced by expectations or emotions. But even imperfect notes are often more useful than trying to reconstruct several months of training from memory.
The important thing is to write them while the experience is still fresh. Waiting until the end of the week to record five different sessions usually means forgetting details or mixing them together.
A few minutes after training can save you a surprising amount of guesswork later.
What Should You Actually Write Down?
One reason people abandon their dive logbooks is that they make the process unnecessarily complicated. They start with good intentions, create an elaborate system and decide to record every possible detail. After a few sessions, filling it in becomes another task they don't particularly enjoy, and eventually the notebook disappears into a drawer.
There's no need for that.
A useful logbook should be detailed enough to help you understand your training but simple enough that you'll actually maintain it.
Start with the basics. Record the date, location, discipline and general conditions. If you're training depth, information such as water temperature, visibility, currents and approximate thermocline depth can provide useful context. If you're training in a pool, note the discipline and the type of session.
Then record what you actually did.
For depth training, this might include your dives, the depths reached and the technical focus of the session. For pool training, it could include distances, exercise types and the general structure of the workout. Surface intervals and recovery information may also be relevant, particularly when reviewing how a session was organized.
But the numbers are only part of the story.
Two dives to exactly the same depth can feel completely different. One might be relaxed and technically controlled, while the other involves unnecessary effort, poor positioning or uncomfortable equalization. If you only record the depth, those two performances look identical.
That's why subjective observations matter.
How did your preparation feel? Was your descent controlled? Did you notice unnecessary tension? Was your equalization comfortable? Did you maintain the technique you intended to practise? Were you mentally focused, distracted or unusually nervous?
You don't need to write an essay about every dive. A few clear sentences are usually enough.
It's also worth recording what you were trying to achieve. If your goal was to improve your finning technique, the most important observation might have nothing to do with depth. Perhaps you finally managed to maintain a smaller, more efficient kick throughout the descent. That's useful information, even if the session involved relatively shallow dives.
Likewise, if you were practising free immersion, you might record whether your pulling technique felt consistent, whether your body remained aligned and whether your movements became less efficient as the dive progressed.
One particularly useful habit is to finish each entry with two simple questions. What went well, and what needs attention next time?
These questions encourage you to reflect without turning the logbook into a collection of complaints.
If something didn't go well, try to describe what happened rather than immediately deciding why it happened. For example, writing that equalization became difficult at a particular depth is an observation. Writing that the problem was definitely caused by fatigue is an interpretation.
That distinction matters because the explanation might be wrong.
Your logbook can help you identify recurring problems, but it shouldn't become a substitute for professional assessment. Pain, unusual symptoms or suspected diving injuries require appropriate medical attention, not another experiment to see whether the same problem happens again.
Similarly, recorded dive times, depths and sensations should never be treated as proof that a future dive will be safe. Freediving risks cannot be reliably predicted from past performance alone.
The purpose of the logbook is to support better understanding and informed conversations with your instructor, not to give you permission to push beyond appropriate limits.
Patterns Become More Valuable Than Personal Bests
The real value of a dive logbook usually becomes apparent after several weeks or months. Individual entries are useful, but when you start comparing them, you can see developments that would otherwise be difficult to recognize.
Perhaps you've been working on equalization for several months. At the beginning, you frequently experienced difficulty during the deeper part of your descents. Your notes show that you gradually became more consistent after making adjustments with your instructor. The improvement didn't happen overnight, and there wasn't necessarily a single breakthrough session.
But looking back, the change is obvious.
This is particularly encouraging during periods when progress feels slow.
Freediving improvement is rarely linear. Some weeks everything feels easy, while others are frustrating for reasons that aren't immediately apparent. You might reach a new depth and then spend several sessions struggling to reproduce the same performance. You might feel technically comfortable one day and unusually inefficient the next.
Without records, it's tempting to interpret these fluctuations as evidence that you're getting worse.
A logbook can provide perspective.
You might discover that your current difficult sessions are still considerably better than your average sessions six months earlier. Or perhaps you've become more consistent even though your maximum depth hasn't changed.
That's an important distinction. A personal best tells you what you've achieved on one occasion. Consistency tells you something about how reliably you can perform within your current abilities.
For most freedivers, the second is at least as important as the first.
Records can also help you understand how training interacts with the rest of your life. Sleep, stress, illness, workload and general fatigue can all influence how you feel during a session. Recording some of these factors may help you notice associations over time.
Maybe you regularly feel less comfortable after several nights of poor sleep. Perhaps your concentration is better when you've allowed enough time to recover between demanding sessions. You might notice that travelling, changes in routine or unusually stressful periods coincide with less consistent training.
These observations aren't necessarily proof of cause and effect. Just because two things happen together doesn't mean one caused the other. But they can provide useful questions to explore with your coach.
A logbook becomes particularly valuable when you're working with an instructor over an extended period.
Instead of arriving at a session and saying that training has felt strange recently, you can explain exactly what you've noticed. You can show when the difficulty started, which sessions were affected and whether anything else changed around the same time.
That gives your instructor more useful information.
It also helps prevent the familiar situation where somebody arrives for training convinced that they haven't improved, only to discover that they've made substantial progress in areas they weren't paying attention to.
Not every improvement is measured in metres or seconds. Better technique, more consistent preparation, improved awareness and more appropriate decisions are all worth recording.
In fact, some of the most valuable entries in a logbook might describe dives you chose not to do.
Recognizing that conditions weren't suitable, that you weren't feeling well or that a particular exercise wasn't appropriate can be an important part of developing good judgement. Those decisions deserve just as much attention as successful performances.
A useful training record should reflect the whole process, not simply the numbers you're proudest of.
A Logbook Should Help You Dive Better, Not Turn Every Dive Into A Competition
There's one potential downside to recording everything, and it's worth discussing because freedivers can become surprisingly attached to numbers.
When you start tracking your training, it's easy to become overly focused on measurable improvement. You compare this week's depths with last week's, look for increases in performance and begin judging sessions according to whether the numbers moved in the direction you wanted.
Before long, the logbook can become another source of pressure.
That's not what it's supposed to do.
A training record should help you understand your progress, not convince you that every session needs to produce a better result than the previous one. Freediving doesn't work that way, and trying to force continuous improvement can lead to poor decisions.
Some sessions are about technique. Others are about maintaining familiar skills, building experience or simply enjoying time in the water. There will also be days when the most appropriate decision is to reduce the workload or stop training altogether.
All of those sessions can be valuable.
If your logbook only rewards increasing depth or distance, you're overlooking much of what makes someone a capable freediver.
One way to avoid this is to record the purpose of each session before evaluating the outcome. If you planned to work on relaxation at a comfortable depth, assess how well you achieved that goal. Don't decide the session was unsuccessful because you didn't go deeper.
Likewise, if your instructor asked you to concentrate on technique rather than performance, the relevant question is whether your technique improved, not whether you reached a new personal best.
This approach also makes it easier to enjoy training.
There's a difference between being interested in your progress and becoming obsessed with documenting it. You don't need to analyse every sensation or turn every dive into a collection of statistics. Sometimes it's enough to write that you had a comfortable session, enjoyed the conditions and felt good in the water.
That information matters too.
At ALFC, we see freedivers arrive with very different attitudes towards training records. Some have detailed spreadsheets covering years of diving. Others have never written down a single session. Neither approach automatically tells us how experienced or capable someone is.
What matters is whether the information helps them understand their training.
A simple notebook that someone updates consistently can be more useful than an elaborate digital system that's abandoned after a month. A few thoughtful observations can tell you more than dozens of numbers recorded without context.
And you don't need to wait until you're training for competitions or reaching impressive depths to start.
In fact, keeping records from the beginning can be particularly valuable. When you're new to freediving, many improvements happen quickly, and it's easy to forget how unfamiliar certain skills once felt. Looking back at your earliest notes can be a surprisingly enjoyable experience.
You might read about struggling with a technique that now feels completely natural, or remember how nervous you were before a depth that has since become comfortable. You might find notes from your first training holiday, your first pool session or the day you finally understood something your instructor had been explaining for weeks.
Over time, your logbook becomes more than a training tool.
It becomes a record of experiences, places and people.
You'll remember the dive site where you first felt truly comfortable in the water, the instructor who helped you solve a persistent problem or the group you trained with during a particularly enjoyable week. You might even find yourself smiling at some of your early observations, especially the ones that reveal how little you understood at the time.
And that's part of the appeal.
Freediving is often described through personal bests, records and extraordinary performances. But most of our time in the sport is spent doing much more ordinary things. We practise, make mistakes, adjust our technique, enjoy good sessions, deal with frustrating ones and gradually become more experienced.
Those experiences deserve to be remembered too.
Keeping a dive logbook doesn't need to change the way you approach freediving. It simply gives you a better way to understand what you're already doing.
You can use a notebook, a spreadsheet, a dedicated application or whatever system feels convenient. Keep the entries manageable, record what genuinely matters and revisit them occasionally. Share relevant observations with your instructor, particularly when you're trying to understand recurring difficulties or plan the next stage of your training.
And remember that the logbook is there to support your diving, not control it.
Years from now, you might not remember every depth you reached or every exercise you completed. But you may be surprised by how much you enjoy reading about the person you were when you first started.
Your personal best will always be an interesting number.
The story of how you got there is usually much more interesting.
Why Every Freediver Should Keep A Dive Logbook
Author: ALFC Team
Most freedivers can remember their personal best. Ask them about the deepest dive they've ever done, and they'll probably give you the exact number, the location and maybe even the date. Some will remember the water temperature, the conditions and how they felt during the descent. But ask them about the ten dives they did before that personal best, and things become a little less clear. How many attempts did it take? What changed between sessions? Were they consistently comfortable at that depth, or was it simply one particularly good day?
This is where keeping a dive logbook becomes interesting. Not because every dive needs to be documented like an important scientific experiment, but because our memories are surprisingly selective. We tend to remember the exceptional dives, the frustrating ones and the moments when something unusual happened. The ordinary sessions, where we practise, make small adjustments and gradually improve, often disappear from memory within a few weeks.
And yet those ordinary sessions are usually where most of our progress happens.
A dive logbook gives you a way to look back at your training without relying entirely on what you think happened. It doesn't need to be complicated. You don't need expensive software, detailed spreadsheets or an obsession with statistics. A simple notebook can be enough. What matters is recording information that helps you understand your diving, recognize patterns and make better decisions about your training.
At ALFC, we encourage freedivers to think beyond individual performances. A successful training session isn't necessarily the one where you reached your greatest depth. Sometimes it's the session where you finally understood a technical problem, became more consistent or recognized that you needed to change your approach. Keeping a logbook makes those developments easier to recognize, particularly when they happen gradually.
And perhaps most importantly, it gives you a more accurate picture of the freediver you're becoming.
Your Memory Is Not A Particularly Reliable Training Tool
There's a good reason why athletes in so many sports keep training records. Human memory isn't designed to preserve every detail of every session, and it becomes even less reliable when emotions are involved. We remember experiences partly according to how they made us feel, which means our recollection of a training period can be quite different from what actually happened.
Imagine you've spent two weeks training depth. You arrived hoping to improve your personal best, but things didn't go exactly as planned. You struggled with equalization during several sessions, felt tired on a few mornings and eventually decided not to attempt the depth you'd originally targeted. When somebody asks how the trip went, you might describe it as disappointing.
But if you'd kept a logbook, you might see something quite different.
Perhaps your average descent technique improved. Maybe you became more consistent at depths that previously required considerable effort. You might notice that your recovery between dives became more comfortable, that your equalization improved at certain stages of the descent or that you were able to complete more technically controlled dives without unnecessary effort.
None of those improvements would necessarily stand out in your memory because they weren't associated with a dramatic achievement. But together, they might represent meaningful progress.
The opposite can happen too. You might remember a training period as particularly successful because you achieved a new personal best. Looking at your records, however, you might discover that most of the surrounding sessions were inconsistent, that you frequently struggled with technique or that you were regularly finishing training feeling exhausted.
That doesn't make the personal best any less real. It simply gives you a more complete picture.
A logbook helps separate individual achievements from overall development.
It can also reveal how often we repeat the same mistakes. Perhaps you regularly begin training too aggressively after several days away from the water. Maybe your equalization becomes less reliable when you're tired, or you tend to struggle during sessions where you've rushed your preparation.
Without written records, these experiences can feel like unrelated incidents. With a logbook, patterns become easier to recognize.
Of course, a logbook isn't automatically objective. The information you record still depends on your observations, and those observations can be influenced by expectations or emotions. But even imperfect notes are often more useful than trying to reconstruct several months of training from memory.
The important thing is to write them while the experience is still fresh. Waiting until the end of the week to record five different sessions usually means forgetting details or mixing them together.
A few minutes after training can save you a surprising amount of guesswork later.
What Should You Actually Write Down?
One reason people abandon their dive logbooks is that they make the process unnecessarily complicated. They start with good intentions, create an elaborate system and decide to record every possible detail. After a few sessions, filling it in becomes another task they don't particularly enjoy, and eventually the notebook disappears into a drawer.
There's no need for that.
A useful logbook should be detailed enough to help you understand your training but simple enough that you'll actually maintain it.
Start with the basics. Record the date, location, discipline and general conditions. If you're training depth, information such as water temperature, visibility, currents and approximate thermocline depth can provide useful context. If you're training in a pool, note the discipline and the type of session.
Then record what you actually did.
For depth training, this might include your dives, the depths reached and the technical focus of the session. For pool training, it could include distances, exercise types and the general structure of the workout. Surface intervals and recovery information may also be relevant, particularly when reviewing how a session was organized.
But the numbers are only part of the story.
Two dives to exactly the same depth can feel completely different. One might be relaxed and technically controlled, while the other involves unnecessary effort, poor positioning or uncomfortable equalization. If you only record the depth, those two performances look identical.
That's why subjective observations matter.
How did your preparation feel? Was your descent controlled? Did you notice unnecessary tension? Was your equalization comfortable? Did you maintain the technique you intended to practise? Were you mentally focused, distracted or unusually nervous?
You don't need to write an essay about every dive. A few clear sentences are usually enough.
It's also worth recording what you were trying to achieve. If your goal was to improve your finning technique, the most important observation might have nothing to do with depth. Perhaps you finally managed to maintain a smaller, more efficient kick throughout the descent. That's useful information, even if the session involved relatively shallow dives.
Likewise, if you were practising free immersion, you might record whether your pulling technique felt consistent, whether your body remained aligned and whether your movements became less efficient as the dive progressed.
One particularly useful habit is to finish each entry with two simple questions. What went well, and what needs attention next time?
These questions encourage you to reflect without turning the logbook into a collection of complaints.
If something didn't go well, try to describe what happened rather than immediately deciding why it happened. For example, writing that equalization became difficult at a particular depth is an observation. Writing that the problem was definitely caused by fatigue is an interpretation.
That distinction matters because the explanation might be wrong.
Your logbook can help you identify recurring problems, but it shouldn't become a substitute for professional assessment. Pain, unusual symptoms or suspected diving injuries require appropriate medical attention, not another experiment to see whether the same problem happens again.
Similarly, recorded dive times, depths and sensations should never be treated as proof that a future dive will be safe. Freediving risks cannot be reliably predicted from past performance alone.
The purpose of the logbook is to support better understanding and informed conversations with your instructor, not to give you permission to push beyond appropriate limits.
Patterns Become More Valuable Than Personal Bests
The real value of a dive logbook usually becomes apparent after several weeks or months. Individual entries are useful, but when you start comparing them, you can see developments that would otherwise be difficult to recognize.
Perhaps you've been working on equalization for several months. At the beginning, you frequently experienced difficulty during the deeper part of your descents. Your notes show that you gradually became more consistent after making adjustments with your instructor. The improvement didn't happen overnight, and there wasn't necessarily a single breakthrough session.
But looking back, the change is obvious.
This is particularly encouraging during periods when progress feels slow.
Freediving improvement is rarely linear. Some weeks everything feels easy, while others are frustrating for reasons that aren't immediately apparent. You might reach a new depth and then spend several sessions struggling to reproduce the same performance. You might feel technically comfortable one day and unusually inefficient the next.
Without records, it's tempting to interpret these fluctuations as evidence that you're getting worse.
A logbook can provide perspective.
You might discover that your current difficult sessions are still considerably better than your average sessions six months earlier. Or perhaps you've become more consistent even though your maximum depth hasn't changed.
That's an important distinction. A personal best tells you what you've achieved on one occasion. Consistency tells you something about how reliably you can perform within your current abilities.
For most freedivers, the second is at least as important as the first.
Records can also help you understand how training interacts with the rest of your life. Sleep, stress, illness, workload and general fatigue can all influence how you feel during a session. Recording some of these factors may help you notice associations over time.
Maybe you regularly feel less comfortable after several nights of poor sleep. Perhaps your concentration is better when you've allowed enough time to recover between demanding sessions. You might notice that travelling, changes in routine or unusually stressful periods coincide with less consistent training.
These observations aren't necessarily proof of cause and effect. Just because two things happen together doesn't mean one caused the other. But they can provide useful questions to explore with your coach.
A logbook becomes particularly valuable when you're working with an instructor over an extended period.
Instead of arriving at a session and saying that training has felt strange recently, you can explain exactly what you've noticed. You can show when the difficulty started, which sessions were affected and whether anything else changed around the same time.
That gives your instructor more useful information.
It also helps prevent the familiar situation where somebody arrives for training convinced that they haven't improved, only to discover that they've made substantial progress in areas they weren't paying attention to.
Not every improvement is measured in metres or seconds. Better technique, more consistent preparation, improved awareness and more appropriate decisions are all worth recording.
In fact, some of the most valuable entries in a logbook might describe dives you chose not to do.
Recognizing that conditions weren't suitable, that you weren't feeling well or that a particular exercise wasn't appropriate can be an important part of developing good judgement. Those decisions deserve just as much attention as successful performances.
A useful training record should reflect the whole process, not simply the numbers you're proudest of.
A Logbook Should Help You Dive Better, Not Turn Every Dive Into A Competition
There's one potential downside to recording everything, and it's worth discussing because freedivers can become surprisingly attached to numbers.
When you start tracking your training, it's easy to become overly focused on measurable improvement. You compare this week's depths with last week's, look for increases in performance and begin judging sessions according to whether the numbers moved in the direction you wanted.
Before long, the logbook can become another source of pressure.
That's not what it's supposed to do.
A training record should help you understand your progress, not convince you that every session needs to produce a better result than the previous one. Freediving doesn't work that way, and trying to force continuous improvement can lead to poor decisions.
Some sessions are about technique. Others are about maintaining familiar skills, building experience or simply enjoying time in the water. There will also be days when the most appropriate decision is to reduce the workload or stop training altogether.
All of those sessions can be valuable.
If your logbook only rewards increasing depth or distance, you're overlooking much of what makes someone a capable freediver.
One way to avoid this is to record the purpose of each session before evaluating the outcome. If you planned to work on relaxation at a comfortable depth, assess how well you achieved that goal. Don't decide the session was unsuccessful because you didn't go deeper.
Likewise, if your instructor asked you to concentrate on technique rather than performance, the relevant question is whether your technique improved, not whether you reached a new personal best.
This approach also makes it easier to enjoy training.
There's a difference between being interested in your progress and becoming obsessed with documenting it. You don't need to analyse every sensation or turn every dive into a collection of statistics. Sometimes it's enough to write that you had a comfortable session, enjoyed the conditions and felt good in the water.
That information matters too.
At ALFC, we see freedivers arrive with very different attitudes towards training records. Some have detailed spreadsheets covering years of diving. Others have never written down a single session. Neither approach automatically tells us how experienced or capable someone is.
What matters is whether the information helps them understand their training.
A simple notebook that someone updates consistently can be more useful than an elaborate digital system that's abandoned after a month. A few thoughtful observations can tell you more than dozens of numbers recorded without context.
And you don't need to wait until you're training for competitions or reaching impressive depths to start.
In fact, keeping records from the beginning can be particularly valuable. When you're new to freediving, many improvements happen quickly, and it's easy to forget how unfamiliar certain skills once felt. Looking back at your earliest notes can be a surprisingly enjoyable experience.
You might read about struggling with a technique that now feels completely natural, or remember how nervous you were before a depth that has since become comfortable. You might find notes from your first training holiday, your first pool session or the day you finally understood something your instructor had been explaining for weeks.
Over time, your logbook becomes more than a training tool.
It becomes a record of experiences, places and people.
You'll remember the dive site where you first felt truly comfortable in the water, the instructor who helped you solve a persistent problem or the group you trained with during a particularly enjoyable week. You might even find yourself smiling at some of your early observations, especially the ones that reveal how little you understood at the time.
And that's part of the appeal.
Freediving is often described through personal bests, records and extraordinary performances. But most of our time in the sport is spent doing much more ordinary things. We practise, make mistakes, adjust our technique, enjoy good sessions, deal with frustrating ones and gradually become more experienced.
Those experiences deserve to be remembered too.
Keeping a dive logbook doesn't need to change the way you approach freediving. It simply gives you a better way to understand what you're already doing.
You can use a notebook, a spreadsheet, a dedicated application or whatever system feels convenient. Keep the entries manageable, record what genuinely matters and revisit them occasionally. Share relevant observations with your instructor, particularly when you're trying to understand recurring difficulties or plan the next stage of your training.
And remember that the logbook is there to support your diving, not control it.
Years from now, you might not remember every depth you reached or every exercise you completed. But you may be surprised by how much you enjoy reading about the person you were when you first started.
Your personal best will always be an interesting number.
The story of how you got there is usually much more interesting.